Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 3,874	$ 4,597
Depreciation expense	21,604	21,559	$ 23,118
Building [Member] | Electromagnetic Clutches and Brakes [Member]
Property, Plant and Equipment [Line Items]
Impairment of assets		1,100
Building [Member] | Couplings, Clutches and Brakes [Member]
Property, Plant and Equipment [Line Items]
Impairment of assets	900	900
Assets held for sale	$ 3,900	$ 4,600