Restructuring, Asset Impairment, and Transition Expenses - Summary of Total Restructuring Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 9,849	$ 7,214	$ 1,767
Couplings, Clutches and Brakes [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	7,302	2,527	444
Electromagnetic Clutches and Brakes [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1,286	1,600	614
Gearing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	287	3,080	603
Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 974	$ 7	$ 106