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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 |  |  |

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