Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended
Dec. 29, 2012
Metals Segment [Member]
Product Liability and Other Damages [Member]
Dec. 31, 2011
Metals Segment [Member]
Product Liability and Other Damages [Member]
Jan. 01, 2011
Metals Segment [Member]
Product Liability and Other Damages [Member]
Nov. 30, 2012
Customer Past Due Invoices [Member]
Pending Litigation [Member]
Specialty Chemicals Segment [Member]
Nov. 30, 2012
Counterclaims [Member]
Pending Litigation [Member]
Specialty Chemicals Segment [Member]
Product Liability Contingency [Line Items]          
Claim expense $ 330 $ 100 $ 500    
Period of collection efforts         12 months
Litigation damages sought       $ 134 $ 3,000