Lease Accounting - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Lessee Lease Description [Line Items]
Lessee, operating lease, existence of option to extend [true false]	true
Right-of-use assets obtained in exchange for operating lease obligations	$ 359,329
New Operating Leases
Lessee Lease Description [Line Items]
Right-of-use assets obtained in exchange for operating lease obligations	$ 8,900
Minimum
Lessee Lease Description [Line Items]
Initial term of real estate lease	5 years
Real estate leases option to extend lease term	5 years
Maximum
Lessee Lease Description [Line Items]
Initial term of real estate lease	10 years
Real estate leases option to extend lease term	10 years