Leases (Additional Information) (Detail) $ in Thousands	6 Months Ended
	Dec. 31, 2019 USD ($) facility location item	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Lessee, Lease, Description [Line Items]
Option to terminate lease	true
Option to extend lease	true
Extension term	5 years
Number of facilities owned by lessor | facility	4
Number of operating lease locations the entity has agreements to sublease either a portion or the full leased space | location	24
Number of leases yet to commence | item	2
Operating Lease, Right-of-Use Asset	$ 187,520			$ 0	$ 0
Operating Lease, Liability	$ 233,031
Operating Lease, Lease Not yet Commenced, Contract One [Member] | Forecast [Member]
Lessee, Lease, Description [Line Items]
Lease term on property lease that has not yet commenced			11 years
Operating Lease, Right-of-Use Asset			$ 10,000
Operating Lease, Liability			$ 10,000
Operating Lease, Lease Not yet Commenced, Contract Two [Member] | Forecast [Member]
Lessee, Lease, Description [Line Items]
Lease term on property lease that has not yet commenced		11 years
Operating Lease, Right-of-Use Asset		$ 9,700
Operating Lease, Liability		$ 9,700