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Discontinued Operations Discontinued Operations - Cequent Spin-off (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of Horizon Shares Received in Spin-off 2 2 2      
TriMas Number of Common Shares Held 5 5 5      
Cash distribution received from Cequent spin-off $ 214,500          
Cequent Spin-off, one-time costs   $ 29,000 $ 30,000      
Debt financing and related expenses       $ (6,640) $ 0 $ (1,970)
Debt Issuance Costs, Net       $ 7,730 $ 4,720  
Cequent businesses [Member] | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Disposal Group, Including Discontinued Operation, Assets 0 0 0      
Disposal Group, Including Discontinued Operation, Liabilities 0 0 0      
Continuing Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cequent Spin-off, one-time costs   3,000        
Debt financing and related expenses   2,000        
Debt Issuance Costs, Net 1,000 1,000 1,000      
Discontinued Operations [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Cequent Spin-off, one-time costs     18,000      
Debt Issuance Costs, Net $ 9,000 $ 9,000 $ 9,000