Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Insurance receivable - asbestos, end of the year	$ 115,945
Asbestos Claims [Member]
Loss Contingencies [Line Items]
Insurance receivable - asbestos, beginning of the year	125,423	$ 140,651
Settlement and defense costs paid by insurance carriers	(23,138)	(15,228)
Changes in estimated coverage	13,660	0
Insurance receivable - asbestos, end of the year	$ 115,945	$ 125,423