Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Loss Contingencies [Line Items]
Insurance receivable – asbestos, beginning of the year	$ 152,508
Insurance receivable – asbestos, end of the period	141,032
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	(11,476)	(13,011)
Insurance receivable – asbestos, end of the period	$ 141,032	$ 87,331