Components of Lease Expense (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease cost		$ 18,115	$ 18,079
Variable and short term lease cost	[1]	10,178	8,046
Total lease cost		28,293	26,125
Finance lease cost:
Amortization of right-of-use-assets		496	481
Interest on lease liabilities		456	484
Total finance lease cost		$ 952	$ 965

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