Components of Lease Expense (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost		$ 73,841	$ 72,098
Variable and short term lease cost	[1]	42,218	35,711
Total lease and rental expense		116,059	107,809
Finance lease cost:
Amortization of property under capital lease		1,985	1,877
Interest on debt of property under capital lease		1,763	1,876
Total finance lease cost		$ 3,748	$ 3,753

[1] Includes equipment, month-to-month and leases with a maturity of less than 12 months.