Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 25,140	$ 35,343	$ 40,182
Other comprehensive income (loss):
Pension liability adjustment, net of tax	139	(989)	(1,685)
Change in fair value of interest rate swap, net of tax	(506)	(283)	8
Foreign currency translation adjustment, net of tax	(11,887)	(20,735)	(21,342)
Total comprehensive income	12,886	13,336	17,163
Comprehensive income attributable to non-controlling interest	0	(129)	(108)
Comprehensive income attributable to Altra Industrial Motion Corp.	$ 12,886	$ 13,207	$ 17,055