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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.

X

- Definition

The pro forma net Income or Loss attributable to the Parent company for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

No definition available.

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X

- 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

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