Supplemental Cash Flow Information Related to Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 115,270	$ 107,239
Operating cash flows from finance leases	1,885	2,078
Financing cash flows from finance leases	2,586	1,959
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	69,678	383,857
Finance leases	$ 37,029	$ 0