Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Loss Contingencies [Line Items]
Insurance receivable – asbestos, end of the period	$ 109,713
Asbestos Claims [Member]
Loss Contingencies [Line Items]
Insurance receivable – asbestos, beginning of the year	117,937	$ 136,932
Settlement and defense costs paid by insurance carriers	(8,224)	(15,348)
Insurance receivable – asbestos, end of the period	$ 109,713	$ 121,584