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Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Reserve for uncollectible accounts receivable $ 1,672 $ 2,101
Accrued compensation 11,436 7,161
Other reserves 3,245 2,036
Current deferred tax assets 16,353 11,298
Accrued compensation 7,012 6,829
Other reserves 659 764
Operating loss carryforwards 1,914 1,387
Less valuation allowance (108) (108)
Non-current deferred tax assets 9,477 8,872
Total deferred tax assets 25,830 20,170
Prepaids (3,448) (1,551)
Other receivables (4,493) (4,931)
Current deferred tax liabilities (7,941) (6,482)
Property and equipment (87,148) (67,726)
Goodwill (82,511) (81,647)
Non-current deferred tax liabilities (169,659) (149,373)
Total deferred tax liabilities $ (177,600) $ (155,855)