Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 182,674	$ 196,610	$ 363,127	$ 389,971
Cost of sales	124,474	136,624	250,297	271,512
Gross profit	58,200	59,986	112,830	118,459
Operating expenses:
Selling, general and administrative expenses	35,870	35,152	69,406	71,454
Research and development expenses	4,514	4,534	9,078	9,296
Restructuring costs	1,641	2,587	3,194	4,343
Total operating expenses	42,025	42,273	81,678	85,093
Income from operations	16,175	17,713	31,152	33,366
Other non-operating income and expense:
Interest expense, net	2,904	2,978	5,800	5,934
Other non-operating (income) expense, net	(205)	750	(483)	(79)
Total other non-operating expense, net	2,699	3,728	5,317	5,855
Income before income taxes	13,476	13,985	25,835	27,511
Provision for income taxes	4,127	4,360	7,676	8,496
Net income	9,349	9,625	18,159	19,015
Net loss attributable to non-controlling interest	0	54	0	63
Net income attributable to Altra Industrial Motion Corp.	$ 9,349	$ 9,679	$ 18,159	$ 19,078
Weighted average shares, basic (in shares)	25,699	26,280	25,699	26,204
Weighted average shares, diluted (in shares)	25,968	26,450	25,793	26,287
Net income per share:
Basic net income attributable to Altra Industrial Motion Corp. (in usd per share)	$ 0.36	$ 0.37	$ 0.71	$ 0.73
Diluted net income attributable to Altra Industrial Motion Corp. (in usd per share)	0.36	0.37	0.70	0.73
Cash dividend declared (in usd per share)	$ 0.15	$ 0.15	$ 0.30	$ 0.27