Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Contingencies And Commitments [Line Items]
Amount paid to implement remedial action work plan	$ 0.1
Accrual for reasonably estimable remediation cost	2.8
Short-term Other Accrued Liabilities [Member]
Contingencies And Commitments [Line Items]
Accrual for reasonably estimable remediation cost	1.1
Other Non-current Liabilities [Member]
Contingencies And Commitments [Line Items]
Accrual for reasonably estimable remediation cost	$ 1.7