Supplemental Cash Flow Information Related to Leases (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 25,884
Operating cash flows from finance leases	575
Financing cash flows from finance leases	433
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	355,981
Finance leases	$ 0