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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]          
Net deferred tax assets $ 141,479   $ 141,479   $ 157,821
Valuation allowance related to net deferred tax assets 4,300   4,300   6,200
Provision for income taxes (28,021) $ (6,021) (66,088) $ (16,352)  
Liability for uncertain tax positions $ 16,563   $ 16,563   $ 13,797