Litigation - Schedule of Loss Contingencies by Contingency (Detail) - Asbestos Claims [Member]	9 Months Ended
	Sep. 30, 2021 USD ($) Claim	Sep. 30, 2020 USD ($) Claim
Loss Contingencies [Line Items]
Total claims pending at the beginning of the period	5,891	6,102
New claims served	943	769
Claims dismissed	(525)	(725)
Claims settled	(301)	(278)
Total claims pending at the end of period	6,008	5,868
Administrative closures	(2,914)
Total active claims at the end of the period	3,094
Gross settlement and defense costs paid in period | $	$ 14,329,000	$ 21,699,000
Avg. gross settlement and defense costs per claim resolved | $	$ 17,350	$ 21,630