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Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 324,389 | $ 275,402
Tax credits | 6,404 | 9,053
Expense associated with stock options and restricted stock | 13,375 | 12,126
Workers' compensation allowance | 19,900 | 19,323
Other | 22,423 | 25,891
Total deferred tax assets, gross | 386,491 | 341,795
Allowance to reduce deferred tax asset to expected realizable value | (13,232) |
Total deferred tax assets, net | 373,259 | 341,795
Deferred tax liabilities: |  |
Property and equipment basis difference | (669,196) | (678,093)
Other | (10,224) | (10,663)
Total deferred tax liabilities | (679,420) | (688,756)
Net deferred tax liability | $ (306,161) | $ (346,961)

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