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Acquisitions - Pro Forma (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition, Pro Forma Information |  |  |
Net Sales | [1] | $ 936,440 | $ 853,590
Net income attributable to TriMas Corporation | [1] | 49,590 | 56,550
Allfast Fasteners [Member] |  |  |
Business acquisition, pre-tax pro-forma amortization expense |  | 6,000 | 6,800
Business acquisition, pre-tax pro-forma interest expense |  | $ 4,900 | $ 7,100
[1] | The supplemental pro forma results reflect certain material adjustments, as follows:1.Pre-tax pro forma adjustments for amortization expense of $6.0 million and $6.8 million for the years ended December 31, 2014 and December 31, 2013 on the intangible assets associated with the acquisition. 2.Pre-tax pro forma adjustments of $4.9 million and $7.1 million for the years ended December 31, 2014 and December 31, 2013, respectively, to reflect interest expense incurred on the incremental term loan A and revolver borrowings incurred in order to fund the acquisition.

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