v3.3.1.900
Document and Entity Information Document - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Feb. 19, 2016
Jun. 30, 2014
Entity Information [Line Items]      
Entity Registrant Name TRIMAS CORP    
Entity Central Index Key 0000842633    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Dec. 31, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   45,332,516  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 1,323.2