Commitments and Contingencies - Legal Matters - Additional Information (Detail)	9 Months Ended	225 Months Ended
	Sep. 30, 2020 USD ($) Case	Sep. 30, 2020 USD ($) 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	201	201	209
Number of new cases filed	61
Number of cases dismissed	65
Number of cases settled	4
Assessment regarding Loss contingency impact Description	We are not aware of any 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.