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Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued compensation | $ 9,441 | $ 20,651
Other reserves | 6,736 | 8,580
Tax credit carryforwards | 3,411 | 1,694
Operating loss carryforwards | 1,388 | 1,399
Total gross deferred income taxes | 20,976 | 32,324
Valuation allowances | (1,681) | (456)
Total deferred tax assets | 19,295 | 31,868
Prepaids | (3,587) | (3,401)
Other receivables | (2,462) | (3,051)
Property and equipment | (79,224) | (105,905)
Goodwill | (55,117) | (84,170)
Total deferred tax liabilities | (140,390) | (196,527)
Total deferred taxes | $ (121,095) | $ (164,659)

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