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Acquisitions - Pro Forma (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |
Net Sales | $ 338,430 | [1] | $ 302,490 | [1] | $ 644,030 | [1] | $ 572,230 | [1]
Net income (loss) attributable to TriMas Corporation | $ 16,660 | [1] | $ 17,290 | [1] | $ 31,120 | [1] | $ 26,040 | [1]
[1] | The supplemental pro forma results reflect certain adjustments, such as adjustments for acquisition costs incurred and purchase accounting adjustments related to step-up in value and subsequent amortization of inventory and intangible assets.

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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463 + Details
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