Commitments and Contingencies - Roll-forward of Remediation Reserves Included in Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 10,642	$ 11,444
Remediation expense	199	2,769
Net remediation payments	(398)	(3,639)
Other activity	(12)	68
Balance at end of the period	$ 10,431	$ 10,642