Consolidated Statement of Shareholders' Equity Statement (USD $) In Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balances at Dec. 31, 2013	$ 549,410	$ 450	$ 816,450	$ (295,320)	$ 27,830
Net income attributable to TriMas Corporation	67,000			67,000
Other comprehensive income (loss)	(5,200)				(5,200)
Shares surrendered upon vesting of options and restricted stock awards to cover tax obligations	(2,780)		(2,780)
Stock option exercises and restricted stock vesting	480	0	480
Excess tax benefits from stock based compensation	1,100		1,100
Non-cash compensation expense	6,690		6,690
Acquisition of remaining 30% interest in Arminak & Associates, LLC, net of tax	(15,990)		(15,990)
Balances at Sep. 30, 2014	$ 600,710	$ 450	$ 805,950	$ (228,320)	$ 22,630