Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Operating Lease, Right-of-Use Asset	$ 287,500		$ 292,100
Operating Lease, Liability	318,700		$ 323,000
Lessee, Operating Lease, Liability, Payments, Due	8,100	$ 7,700
Significant change in expected future minimum lease payments since year end	$ 0