Commitments and Contingencies - Additional Information (Detail)	12 Months Ended	228 Months Ended
	Dec. 31, 2020 USD ($) Case	Dec. 31, 2020 USD ($) Case	Dec. 31, 2019 Case
Commitments And Contingencies Disclosure [Abstract]
Cumulative settlement payments for cases involving asbestos-related claims | $		$ 3,100,000
Cumulative settlement payments made for cases involving asbestos-related claims with all legal fees other than corporate counsel expenses | $		2,900,000
Average cost per settled claim excluding legal fees | $	$ 34,000	$ 34,000
Number of claims pending	200	200	209
Number of new cases filed	77
Number of cases dismissed	81
Number of cases settled	5
Assessment regarding Loss contingency impact Description	We are not aware of pending claims or assessments, other than as described above, which may have a material adverse impact on our liquidity, financial position, results of operations, or cash flows.