Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jan. 01, 2019
Operating Lease, Right-of-Use Asset	$ 304,900		$ 304,900		$ 297,700	$ 170,500
Operating Lease, Liability	334,800		334,800		$ 323,700	$ 174,400
Lessee, Operating Lease, Liability, Payments, Due	$ 8,100	$ 6,100	15,800	$ 12,100
Significant change in expected future minimum lease payments since year end			$ 0