v2.4.0.6
Document and Entity Information Document
3 Months Ended
Mar. 31, 2013
Apr. 19, 2013
Entity Information [Line Items]    
Entity Registrant Name TRIMAS CORP  
Entity Central Index Key 0000842633  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Document Type 10-Q  
Document Period End Date Mar. 31, 2013  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   39,695,306