Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 5,313	$ 10,221	$ 23,472	$ 29,236
Other Comprehensive income (loss):
Foreign currency translation adjustment	104	(4,474)	(866)	(16,242)
Change in fair value of interest rate swap, net of tax	0	(64)	0	(283)
Other comprehensive loss	104	(4,538)	(866)	(16,525)
Comprehensive income	5,417	5,683	22,606	12,711
Comprehensive loss attributable to non-controlling interest	0	0	0	(192)
Comprehensive income attributable to Altra Industrial Motion Corp.	$ 5,417	$ 5,683	$ 22,606	$ 12,903