Acquisitions - Pro Forma (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Business Acquisition, Pro Forma Information [Abstract]
Net Sales	$ 335,870	[1]	$ 295,080	[1]	$ 979,900	[1]	$ 867,310	[1]
Net income (loss) attributable to TriMas Corporation	$ 18,670	[1]	$ 19,390	[1]	$ 49,790	[1]	$ 45,420	[1]

[1] The supplemental pro forma results from continuing operations 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.