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Supplemental Guarantor Condensed Consolidating Financial Information - Condensed Comprehensive Income Statement (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Financial Statements, Captions [Line Items]        
Net income (loss), including portion attributable to noncontrolling interest $ 19,960 $ 18,270 $ 49,380 $ 47,110
Net income (loss) attributable to TriMas Corporation 18,670 18,270 47,820 47,110
Other comprehensive income        
Amortization of defined benefit plan deferred (gains) losses, net of tax (740) 60 (530) 170
Foreign currency translation 3,040 (11,340) 2,680 (3,990)
Net changes in unrealized loss on interest rate swaps, net of tax (80) 0 (1,000) 230
Total other comprehensive income 2,220 (11,280) 1,150 (3,590)
Total comprehensive income 22,180 6,990 50,530 43,520
Net income (loss) attributable to noncontrolling interests 1,290   1,560  
Total comprehensive income attributable to TriMas Corporation 20,890 6,990 48,970 43,520
Parent [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss), including portion attributable to noncontrolling interest 19,960   49,380  
Net income (loss) attributable to TriMas Corporation 19,960 18,270 49,380 47,110
Other comprehensive income        
Amortization of defined benefit plan deferred (gains) losses, net of tax 0 0 0 0
Foreign currency translation 0 0 0 0
Net changes in unrealized loss on interest rate swaps, net of tax 0   0 0
Total other comprehensive income 0 0 0 0
Total comprehensive income 19,960   49,380  
Net income (loss) attributable to noncontrolling interests 0   0  
Total comprehensive income attributable to TriMas Corporation 19,960 18,270 49,380 47,110
Guarantor [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss), including portion attributable to noncontrolling interest 23,300   65,180  
Net income (loss) attributable to TriMas Corporation 22,010 21,360 63,620 58,540
Other comprehensive income        
Amortization of defined benefit plan deferred (gains) losses, net of tax (820) 30 (700) 90
Foreign currency translation 0 0 0 0
Net changes in unrealized loss on interest rate swaps, net of tax (140)   (1,000) 230
Total other comprehensive income (960) 30 (1,700) 320
Total comprehensive income 22,340   63,480  
Net income (loss) attributable to noncontrolling interests 1,290   1,560  
Total comprehensive income attributable to TriMas Corporation 21,050 21,390 61,920 58,860
Non-Guarantor [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss), including portion attributable to noncontrolling interest 5,340   15,420  
Net income (loss) attributable to TriMas Corporation 5,340 6,990 15,420 16,890
Other comprehensive income        
Amortization of defined benefit plan deferred (gains) losses, net of tax 80 30 170 80
Foreign currency translation 3,040 (11,340) 2,680 (3,990)
Net changes in unrealized loss on interest rate swaps, net of tax 60   0 0
Total other comprehensive income 3,180 (11,310) 2,850 (3,910)
Total comprehensive income 8,520   18,270  
Net income (loss) attributable to noncontrolling interests 0   0  
Total comprehensive income attributable to TriMas Corporation 8,520 (4,320) 18,270 12,980
Eliminations [Member]
        
Condensed Financial Statements, Captions [Line Items]        
Net income (loss), including portion attributable to noncontrolling interest (28,640)   (80,600)  
Net income (loss) attributable to TriMas Corporation (28,640) (28,350) (80,600) (75,430)
Other comprehensive income        
Amortization of defined benefit plan deferred (gains) losses, net of tax 0 0 0 0
Foreign currency translation 0 0 0 0
Net changes in unrealized loss on interest rate swaps, net of tax 0   0 0
Total other comprehensive income 0 0 0 0
Total comprehensive income (28,640)   (80,600)  
Net income (loss) attributable to noncontrolling interests 0   0  
Total comprehensive income attributable to TriMas Corporation $ (28,640) $ (28,350) $ (80,600) $ (75,430)