Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforward	$ 788,375	$ 879,339
Divestiture contract obligation	112,199	132,352
Deferred compensation	22,121	16,635
Equity compensation	4,833	5,445
Asset retirement obligations	21,734	18,923
Interest expense carryforward	53,876	15,757
Lease deferred tax assets	9,954	16,070
Cumulative mark-to-market loss	32,221	2,607
Other	12,181	12,082
Valuation allowances:
Total deferred tax assets	786,425	720,191
Deferred tax liabilities:
Depreciation and depletion	(879,163)	(835,506)
Leases	(9,247)	(15,058)
Other	(15,657)	(4,894)
Total deferred tax liabilities	(904,067)	(855,458)
Net deferred tax liability	(117,642)	(135,267)
Federal
Valuation allowances:
Valuation allowances	(67,984)	(152,499)
State, net of federal benefit
Valuation allowances:
Valuation allowances	$ (203,085)	$ (226,520)