Restructuring, Asset Impairment, and Transition Expenses - Summary of Total Restructuring Expense (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring costs		$ 1,898	$ 1,553
Operating Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		1,898	1,553
Operating Segments [Member] | Couplings, Clutches and Brakes [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		1,361	404
Operating Segments [Member] | Electromagnetic Clutches and Brakes [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs			673
Operating Segments [Member] | Gearing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs		296	16
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	[1]	$ 241	$ 460

[1] Certain expenses are maintained at the corporate level and not allocated to the segments. These include various administrative expenses related to corporate headquarters, depreciation on capitalized software costs, non-capitalizable software implementation costs and acquisition related expenses and non-cash partial pension settlements.