Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Loss Contingencies [Line Items]
Insurance receivable – asbestos, end of the period	$ 112,279
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	(5,658)	(11,823)
Insurance receivable – asbestos, end of the period	$ 112,279	$ 125,109