Annual report pursuant to Section 13 and 15(d)

Stock Options, Stock Grants and New Stock (Narrative) (Details)

v2.4.1.9
Stock Options, Stock Grants and New Stock (Narrative) (Details) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended
Sep. 30, 2013
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Feb. 20, 2014
Feb. 07, 2013
Feb. 09, 2012
Aug. 21, 2012
Oct. 16, 2014
Apr. 24, 2014
Apr. 25, 2013
Nov. 21, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Options granted, weighted average fair value (dollars per share)   $ 6.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 7.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 6.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue                
Stock options exercised (in shares)   17,074us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 15,247us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 11,800us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                
Options exercisable (shares)   56,787us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber                    
Options exercisable, weighted average exercise price (dollars per share)   $ 11.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice                    
Share-based compensation expense   $ 364,157us-gaap_ShareBasedCompensation $ 331,362us-gaap_ShareBasedCompensation $ 337,750us-gaap_ShareBasedCompensation                
Issuance of shares of common stock from the treasury (in shares)   14,522us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued 17,572us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued 19,089us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued                
Issuance of common stock (shares)     2,300,000us-gaap_StockIssuedDuringPeriodSharesNewIssues                  
Proceeds from Issuance of Common Stock 34,233,000us-gaap_ProceedsFromIssuanceOfCommonStock                      
Planned Payments to Acquire Machinery and Equipment 3,500,000synl_PlannedPaymentstoAcquireMachineryandEquipment                      
Stock Options [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock options exercised (in shares)   17,074us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		15,247us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		11,800us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		               
Option exercises, aggregate exercise price   192,000synl_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodAggregateExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		163,000synl_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodAggregateExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		124,000synl_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodAggregateExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		               
Cash received from exercise of stock options   42,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		138,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		124,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		               
Stock Repurchased During Period, Shares   9,094us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		1,752us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		                 
Stock repurchased during year   150,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		25,000us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		                 
Options exercisable (shares)   56,787us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		40,591us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		29,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		               
Options exercisable, weighted average exercise price (dollars per share)   $ 11.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		$ 11.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		$ 10.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		               
Share-based compensation expense   261,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		249,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		228,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		               
Total unrecognized compensation cost   459,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		                   
Share-based compensation, weighted average period of recognition (years)   2 years 3 months 25 days                    
2011 Plan [Member] | Stock Options [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Options granted (shares)         13,790us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		40,594us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		36,740us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		         
Options granted, weighted average exercise price (dollars per share)         $ 14.76us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		$ 13.70us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		$ 11.35us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		         
Options granted, weighted average fair value (dollars per share)         $ 6.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		$ 6.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		$ 5.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		         
Risk free interest rate (percent)         2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		2.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		2.04%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		         
Expected volatility rate (percent)         52.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		53.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		53.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		         
Expected life (years)         7 years 7 years 7 years          
Expected dividend yield (percent)         1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		         
Annual vesting rate (percent)         20.00%synl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember 		             
2005 Stock Awards Plan [Member] | Stock Awards [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Annual vesting rate (percent)   20.00%synl_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		                   
Share-based compensation expense   103,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		82,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		110,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		               
Total unrecognized compensation cost   902,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		                   
Share-based compensation, weighted average period of recognition (years)   4 years 6 months 18 days                    
Period after option grant before options can be exercised (years)   1 year                    
Share-based compensation expense, period of recognition (years)   60 months                    
Share-based compensation expense, net of taxes   66,000synl_ShareBasedCompensationNetOfTaxes
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		52,000synl_ShareBasedCompensationNetOfTaxes
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		70,000synl_ShareBasedCompensationNetOfTaxes
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		               
Share-based compensation expense, net of taxes, (dollars per share)   $ 0.01synl_ShareBasedCompensationNetOfTaxesPerShare
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		$ 0.01synl_ShareBasedCompensationNetOfTaxesPerShare
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		$ 0.01synl_ShareBasedCompensationNetOfTaxesPerShare
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember 		               
President of Palmer [Member] | 2011 Plan [Member] | Stock Options [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Options granted (shares)               75,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= synl_PresidentOfAcquireeMember 		       
Options granted, weighted average exercise price (dollars per share)               $ 12.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= synl_PresidentOfAcquireeMember 		       
Options granted, weighted average fair value (dollars per share)               $ 5.44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= synl_PresidentOfAcquireeMember 		       
Risk free interest rate (percent)               1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= synl_PresidentOfAcquireeMember 		       
Expected volatility rate (percent)               51.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= synl_PresidentOfAcquireeMember 		       
Expected life (years)               7 years        
Expected dividend yield (percent)               2.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_PlanNameAxis
= synl_A2011PlanMember
/ us-gaap_TitleOfIndividualAxis
= synl_PresidentOfAcquireeMember 		       
Chief Executive Officer [Member] | 2005 Stock Awards Plan [Member] | Stock Awards [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Granted (shares)                 31,080us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember 		     
Granted, weighted average grant date fair value (dollars per share)                 $ 15.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember 		     
Non Employee Director [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Issuance of shares of common stock from the treasury (in shares)                   7,088us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
/ us-gaap_TitleOfIndividualAxis
= synl_NonEmployeeDirectorMember 		9,411us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
/ us-gaap_TitleOfIndividualAxis
= synl_NonEmployeeDirectorMember 		 
Annual cash retainer fees                   111,000synl_AnnualCashRetainerFees
/ us-gaap_TitleOfIndividualAxis
= synl_NonEmployeeDirectorMember 		128,000synl_AnnualCashRetainerFees
/ us-gaap_TitleOfIndividualAxis
= synl_NonEmployeeDirectorMember 		 
Public Offering [Member] | Common Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Issuance of common stock (shares) 2,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= synl_PublicOfferingMember 		                     
Price of stock (usd per share) $ 15.75us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= synl_PublicOfferingMember 		                     
Repayments of lines of credit $ 18,061,000us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= synl_PublicOfferingMember 		                     
Over-Allotment Option [Member] | Common Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Issuance of common stock (shares) 300,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_OverAllotmentOptionMember 		                     
Price of stock (usd per share) $ 15.75us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_OverAllotmentOptionMember 		                     
Restricted Stock [Member] | Non Employee Director [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Maximum annual retainer percent   100.00%synl_AnnualElectedRetainerFeesPercent
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= synl_NonEmployeeDirectorMember 		                   
Specialty Pipe And Tube, Inc. [Member] | Certain Management Employees [Member] | 2005 Stock Awards Plan [Member] | Stock Awards [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Granted (shares)                       23,665us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_BusinessAcquisitionAxis
= synl_SpecialtyPipeAndTubeInc.Member
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember
/ us-gaap_TitleOfIndividualAxis
= synl_CertainManagementEmployeesMember
Granted, weighted average grant date fair value (dollars per share)                       $ 15.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= synl_StockAwardsMember
/ us-gaap_BusinessAcquisitionAxis
= synl_SpecialtyPipeAndTubeInc.Member
/ us-gaap_PlanNameAxis
= synl_A2005StockAwardsPlanMember
/ us-gaap_TitleOfIndividualAxis
= synl_CertainManagementEmployeesMember