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Income Tax - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Operating expenses not currently deductible $ 18,721 $ 9,953
Stock option and other employee benefit plans 19,665 13,504
Capital loss and credit carryforward 0 179
Total deferred income tax assets 38,386 23,636
Intangible assets (103,754) (111,653)
Property and equipment (3,207) (2,781)
Other (204) (228)
Total deferred income tax liabilities (107,165) (114,662)
Net deferred income tax liabilities $ (68,779) $ (91,026)