Income Taxes - Schedule of Benefit (Provision) for Income Taxes Attributable to Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal:
Current	$ 207,544	$ (4,928)	$ 11,991
Deferred (excluding separate components)	19,852	(537,993)	(143,468)
Deferred – valuation allowance	(42,109)	(20,175)	(19,753)
Other noncurrent	4,922	(5,745)	576
Benefit (provision) for federal income taxes	190,209	(568,841)	(150,654)
State:
Current	(816)	(22,685)	(12,564)
Deferred (excluding separate components)	(33,087)	(32,793)	(12,731)
Deferred – operating loss carryforward	47,728	(5,241)	(29,490)
Deferred – valuation allowance	(3,375)	(191)	41,068
Other noncurrent	(946)	(1,401)	(1,334)
Benefit (provision) for state income taxes	9,504	(62,311)	(15,051)
Foreign:
Current	(828)	(2,454)	(2,037)
Deferred (excluding separate components)	4,206	44,374	63,827
Deferred – operating loss carryforward	39,920	32,915	30,574
Deferred – valuation allowance	(51,439)	(76,028)	23,229
Benefit (provision) for foreign income taxes	(8,141)	(1,193)	115,593
Benefit (provision) for income taxes	$ 191,572	$ (632,345)	$ (50,112)

The component of total income tax expense for the period comprised of increase (decrease) in the entity's federal deferred tax assets and liabilities attributable to continuing operations, excluding operating loss and valuation allowance, as determined by applying the provisions of the applicable enacted tax laws.

No definition available.