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	18,570			18,570
Other comprehensive income	2,370				2,370
Shares surrendered upon vesting of options and restricted stock awards to cover tax obligations	(2,670)		(2,670)
Stock option exercises and restricted stock vesting	140	0	140
Excess tax benefits from stock based compensation	760		760
Non-cash compensation expense	2,280		2,280
Acquisition of remaining 30% interest in Arminak & Associates, LLC, net of tax	(15,990)		(15,990)
Balances at Mar. 31, 2014	$ 554,870	$ 450	$ 800,970	$ (276,750)	$ 30,200