Commitments and Contingencies - Additional Information (Detail) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Estimated remediation liabilities included in accrued liabilities	$ 700,000	$ 600,000
Estimated remediation liabilities included in other noncurrent liabilities	2,100,000	2,000,000
Accrued liabilities for legal contingencies	0	$ 0
Discounted lease amount recognized	$ 600,000
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Unconditional purchase obligation, due in next fiscal year	$ 65,000,000
Unconditional purchase obligation, due thereafter	$ 0