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, 2014	$ 590,630	$ 450	$ 806,810	$ (226,850)	$ 10,220
Net income attributable to TriMas Corporation	13,980			13,980
Other comprehensive income (loss)	(6,680)				(6,680)
Shares surrendered upon vesting of options and restricted stock awards to cover tax obligations	(2,560)		(2,560)
Stock option exercises and restricted stock vesting	430	0	430
Excess tax benefits from stock based compensation	200		200
Non-cash compensation expense	2,520		2,520
Balances at Mar. 31, 2015	$ 598,520	$ 450	$ 807,400	$ (212,870)	$ 3,540