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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)

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