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)