Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Insurance receivable - asbestos, beginning of the year	$ 152,508
Insurance receivable - asbestos, end of the year	136,932	$ 152,508
Asbestos Claims [Member]
Loss Contingencies [Line Items]
Insurance receivable - asbestos, beginning of the year	152,508	100,342
Settlement and defense costs paid by insurance carriers	(15,576)	(17,420)
Change in estimated coverage	0	69,586
Insurance receivable - asbestos, end of the year	$ 136,932	$ 152,508