Lease Accounting - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 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	$ 355,981
New Operating Leases
Lessee Lease Description [Line Items]
Right-of-use assets obtained in exchange for operating lease obligations	$ 6,000
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