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Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
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)