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	44,770			44,770
Other comprehensive income	4,990				4,990
Shares surrendered upon vesting of options and restricted stock awards to cover tax obligations	(2,740)		(2,740)
Stock option exercises and restricted stock vesting	430	0	430
Excess tax benefits from stock based compensation	1,030		1,030
Non-cash compensation expense	4,360		4,360
Acquisition of remaining 30% interest in Arminak & Associates, LLC, net of tax	(15,990)		(15,990)
Balances at Jun. 30, 2014	$ 586,260	$ 450	$ 803,540	$ (250,550)	$ 32,820