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Discontinued Operations Discontinued Operations - Cequent Spin-off (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 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 |  |
TriMas Number of Common Shares Held |  | 5 |  |
Cash distribution received from Cequent spin-off | $ 214,500 | $ 214,500 |  |
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
Disposal Group, Including Discontinued Operation, Liabilities |  |  | $ 0 | $ 0

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