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Summary of Deferred Tax Assets and Liabilities Presented as Noncurrent (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued compensation | $ 20,651 | $ 18,448
Other reserves | 8,580 | 4,319
Tax credit carryforwards | 1,694 | 1,257
Operating loss carryforwards | 1,399 | 1,914
Total gross deferred income taxes | 32,324 | 25,938
Valuation allowances | (456) | (108)
Total deferred tax assets | 31,868 | 25,830
Prepaids | (3,401) | (3,448)
Other receivables | (3,051) | (4,493)
Property and equipment | (105,905) | (87,148)
Goodwill | (84,170) | (82,511)
Total deferred tax liabilities | (196,527) | (177,600)
Total deferred taxes | $ (164,659) | $ (151,770)

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