Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Loss Contingencies [Line Items]
Insurance receivable - asbestos, beginning of the year	$ 115,945
Insurance receivable - asbestos, end of the period	112,319
Asbestos Claims [Member]
Loss Contingencies [Line Items]
Insurance receivable - asbestos, beginning of the year	115,945	$ 125,243
Settlement and defense costs paid by insurance carriers	(3,626)	(2,675)
Insurance receivable - asbestos, end of the period	$ 112,319	$ 122,748