Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Accounts receivable, principally due to the allowance for doubtful accounts	$ 10,515	$ 9,586
Accrued expenses not currently deductible for tax	3,442	2,305
Lease deferral	23,506	24,713
Interest rate swap	21,792	13,781
Stock based compensation	36,015	39,779
Income tax credits	51,264	35,845
Net operating loss carry forwards	83,372	67,108
Accrued escheat	3,567	3,098
Other	11,711	3,522
Deferred tax assets before valuation allowance	245,184	199,737
Valuation allowance	(90,340)	(64,482)
Deferred tax assets, net	154,844	135,255
Deferred tax liabilities:
Intangibles—including goodwill	(481,388)	(499,525)
Basis difference in investment in subsidiaries	(42,313)	(42,314)
Lease deferral	(19,977)	(21,810)
Accrued Expense Liability	(513)	(4,023)
Prepaid expenses	(2,126)	(2,075)
Withholding taxes	(30,488)	(30,366)
Property and equipment and other	(71,342)	(52,467)
Deferred tax liabilities	(648,147)	(652,580)
Net deferred tax liabilities	$ (493,303)	$ (517,325)