Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Reconciliation of Basic to Diluted Net Income Per Share

The following is a reconciliation of basic to diluted net income per share:

	Years Ended December 31,
	2016		2015		2014
Net income attributable to Altra Industrial Motion Corp.	$	25,140	$	35,406	$	40,167
Shares used in net income per common share - basic		25,719		26,064		26,713
Dilutive effect of the equity premium on Convertible Notes    at the average price of common stock		132		43		612
Incremental shares of unvested restricted common stock		21		2		78
Shares used in net income per common share - diluted		25,872		26,109		27,403
Earnings per share:
Basic net income attributable to Altra Industrial    Motion Corp.	$	0.97	$	1.36	$	1.50
Diluted net income attributable to Altra Industrial    Motion Corp.	$	0.97	$	1.36	$	1.47

Depreciation of Property, Plant and Equipment, Including Capital Leases is Provided Using Straight-Line Method Over Estimated Useful Life of Asset

Depreciation of property, plant and equipment, including capital leases is provided using the straight-line method over the estimated useful life of the asset, as follows:

Buildings and improvements	15 to 45 years
Machinery and equipment	2 to 15 years
Capital lease	Life of lease

Changes in Accumulated Other Comprehensive Loss by Component

The following is a reconciliation of changes in Accumulated Other Comprehensive Loss for the periods presented:

	Gains and Losses on Cash Flow Hedges			Defined Benefit Pension Plans			Cumulative Foreign Currency Translation Adjustment			Total
Accumulated Other Comprehensive Loss by Component,    January 1, 2014	$	135		$	(3,133	)	$	(15,398	)	$	(18,396	)
Net current-period Other Comprehensive Income (Loss), net of tax		8			(1,685	)		(21,342	)		(23,019	)
Accumulated Other Comprehensive Income (Loss) by Component,    December 31, 2014		143			(4,818	)		(36,740	)		(41,415	)
Cumulative losses transferred from Lamiflex		—			—			(410	)		(410	)
Net current-period Other Comprehensive Income (Loss), net of tax		(283	)		(989	)		(20,735	)		(22,007	)
Accumulated Other Comprehensive Loss by Component,   December 31, 2015		(140	)		(5,807	)		(57,885	)		(63,832	)
Net current-period Other Comprehensive Income Loss, net of tax		(506	)		139			(11,887	)		(12,254	)
Accumulated Other Comprehensive Loss by Component,   December 31, 2016	$	(646	)	$	(5,668	)	$	(69,772	)	$	(76,086	)