Commitments and Contingencies - Roll-forward of Remediation Reserves Included in Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 10,642	$ 11,444
Remediation expense	421	2,769
Net remediation payments	(806)	(3,639)
Other activity	8	68
Balance at end of the period	$ 10,265	$ 10,642