Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal, State and Local Tax [Member]
Reconciliation Of Unrecognized Tax Benefits [Line Items]
Beginning Balance	$ 58,969	$ 56,274	$ 45,432
Increases as a result of tax positions taken during the period		6,996	13,426
Increases as a result of tax positions taken in prior years		3,265
Decreases as a result of settlements with taxing authorities			(664)
Decreases as a result of tax positions taken in prior years	(10,107)	(7,566)	(1,920)
Ending Balance	48,862	58,969	56,274
Accrued Interest [Member]
Reconciliation Of Unrecognized Tax Benefits [Line Items]
Beginning Balance	7,199	6,629	5,651
Increases as a result of tax positions taken in prior years	2,800	3,255	1,969
Decreases as a result of settlements with taxing authorities			(289)
Decreases as a result of tax positions taken in prior years	(2,384)	(2,685)	(702)
Ending Balance	7,615	7,199	6,629
Unrecognized Income Tax Benefits [Member]
Reconciliation Of Unrecognized Tax Benefits [Line Items]
Beginning Balance	66,168	62,903	51,083
Increases as a result of tax positions taken during the period		6,996	13,426
Increases as a result of tax positions taken in prior years	2,800	6,520	1,969
Decreases as a result of settlements with taxing authorities			(953)
Decreases as a result of tax positions taken in prior years	(12,491)	(10,251)	(2,622)
Ending Balance	56,477	$ 66,168	$ 62,903
Less: Federal, state and local income tax benefits	(11,174)
Net unrecognized tax benefits that, if recognized, would impact the effective income tax rate	$ 45,303