Tax Effect of Temporary Differences and Tax Attributes Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carryforwards	$ 457,362	$ 370,875
Tax credits	4,453	4,918
Expense associated with stock-based compensation	9,364	11,252
Workers' compensation allowance	14,833	17,177
Other deferred tax asset	26,483	24,735
Total deferred tax assets, gross	512,495	428,957
Valuation allowance	(189,737)	(19,133)
Total deferred tax assets, net	322,758	409,824
Deferred tax liabilities:
Property and equipment basis difference	(335,980)	(475,025)
Other	(12,037)	(12,475)
Total deferred tax liabilities	(348,017)	(487,500)
Net deferred tax liability	$ (25,259)	$ (77,676)