Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 173,132	$ 183,053	$ 536,259	$ 573,024
Cost of sales	118,957	127,253	369,254	398,765
Gross profit	54,175	55,800	167,005	174,259
Operating expenses:
Selling, general and administrative expenses	36,142	34,279	105,548	105,733
Research and development expenses	4,267	4,210	13,345	13,506
Restructuring costs	3,397	651	6,591	4,994
Total operating expenses	43,806	39,140	125,484	124,233
Income from operations	10,369	16,660	41,521	50,026
Other non-operating income and expense:
Interest expense, net	2,815	2,924	8,615	8,858
Other non-operating expense (income), net	45	685	(438)	606
Total other non-operating expense, net	2,860	3,609	8,177	9,464
Income before income taxes	7,509	13,051	33,344	40,562
Provision for income taxes	2,196	2,830	9,872	11,326
Net income	5,313	10,221	23,472	29,236
Net loss attributable to non-controlling interest	0	0	0	63
Net income attributable to Altra Industrial Motion Corp.	$ 5,313	$ 10,221	$ 23,472	$ 29,299
Weighted average shares, basic	25,726	26,145	25,684	26,140
Weighted average shares, diluted	26,021	26,145	25,813	26,184
Net income per share:
Basic net income attributable to Altra Industrial Motion Corp.	$ 0.21	$ 0.39	$ 0.91	$ 1.12
Diluted net income attributable to Altra Industrial Motion Corp.	0.20	0.39	0.91	1.12
Cash dividend declared	$ 0.15	$ 0.15	$ 0.45	$ 0.42