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Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 375,308 | $ 324,389
Tax credits | 4,138 | 6,404
Expense associated with stock options and restricted stock | 10,561 | 13,375
Workers' compensation allowance | 19,536 | 19,900
Other deferred tax asset | 21,698 | 22,423
Total deferred tax assets, gross | 431,241 | 386,491
Total deferred tax assets, net | 414,010 | 373,259
Valuation allowance | (17,231) | (13,232)
Deferred tax liabilities: |  |
Property and equipment basis difference | (607,785) | (669,196)
Other | (9,184) | (10,224)
Total deferred tax liabilities | (616,969) | (679,420)
Net deferred tax liability | $ (202,959) | $ (306,161)

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