Income Taxes - Summary of Differences In Effective Tax Rate and Federal Statutory Rate Due to State Income Taxes, Equity Compensation and Other Tax Items (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Total (loss) income before income taxes	$ (74,800)	$ 72,676	$ 87,591	$ 56,236
U.S. federal statutory rate	21.00%	21.00%	21.00%	21.00%
Total tax (benefit) expense at statutory rate	$ (15,708)	$ 15,262	$ 18,394	$ 11,810
State and local income taxes, net of federal benefit	(2,721)	2,691	3,822	3,439
State apportionment rate change	(44,203)		(44,203)
Equity compensation	286	6	4,174	2,146
Change in valuation allowances:
Federal net operating loss carryforwards	916	0	0	0
State net operating loss carryforwards and other	14,952	5,558	15,568	19,194
Other	(481)	100	(782)	1,499
Permanent differences and other	(260)	520	1,595	207
Total (benefit) expense for income taxes	$ (47,219)	$ 24,137	$ (1,432)	$ 38,295
Effective tax rate	63.10%	33.20%	(1.60%)	68.10%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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