Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal, State and Local Tax [Member]
Reconciliation Of Unrecognized Tax Benefits [Line Items]
Beginning Balance	$ 56,274	$ 45,432	$ 35,889
Increases as a result of tax positions taken during the period	6,996	13,426	13,019
Increases as a result of tax positions taken in prior years	3,265
Decreases as a result of settlements with taxing authorities		(664)	(332)
Decreases as a result of tax positions taken in prior years	(7,566)	(1,920)	(3,144)
Ending Balance	58,969	56,274	45,432
Accrued Interest [Member]
Reconciliation Of Unrecognized Tax Benefits [Line Items]
Beginning Balance	6,629	5,651	7,915
Increases as a result of tax positions taken in prior years	3,255	1,969	1,379
Decreases as a result of settlements with taxing authorities		(289)	(168)
Decreases as a result of tax positions taken in prior years	(2,685)	(702)	(3,475)
Ending Balance	7,199	6,629	5,651
Unrecognized Income Tax Benefits [Member]
Reconciliation Of Unrecognized Tax Benefits [Line Items]
Beginning Balance	62,903	51,083	43,804
Increases as a result of tax positions taken during the period	6,996	13,426	13,019
Increases as a result of tax positions taken in prior years	6,520	1,969	1,379
Decreases as a result of settlements with taxing authorities		(953)	(500)
Decreases as a result of tax positions taken in prior years	(10,251)	(2,622)	(6,619)
Ending Balance	66,168	$ 62,903	$ 51,083
Less: Federal, state and local income tax benefits	(13,208)
Net unrecognized tax benefits that, if recognized, would impact the effective income tax rate	$ 52,960