Leases (Additional Information) (Detail) $ in Thousands	6 Months Ended
	Dec. 31, 2020 USD ($) location facility item	Sep. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
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	3
Number of operating lease locations the entity has agreements to sublease either a portion or the full leased space | location	20
Number of leases yet to commence | item	1
Operating Lease, Right-of-Use Asset	$ 192,954		$ 174,935	$ 187,520
Operating Lease, Liability	$ 247,790
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		$ 21,300
Operating Lease, Liability		$ 21,300