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Income Taxes - Provisions for Income Taxes and Effective Income Tax Rates (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 174 $ (527) $ 374 $ (510)
Effective income tax rate 7.80% (12.60%) 17.00% (3.50%)