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Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Accrued compensation | $ 10,538 | $ 9,441
Other reserves | 8,568 | 6,736
Tax credit carryforwards | 5,062 | 3,411
Operating loss carryforwards | 6,914 | 1,388
Total gross deferred income taxes | 31,082 | 20,976
Valuation allowances | (3,128) | (1,681)
Total deferred tax assets | 27,954 | 19,295
Prepaids | (5,409) | (3,587)
Other receivables | (1,588) | (2,462)
Property and equipment | (119,716) | (79,224)
Goodwill | (55,118) | (55,117)
Total deferred tax liabilities | (181,831) | (140,390)
Total deferred taxes | $ (153,877) | $ (121,095)

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