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Income Taxes - Provisions for Income Taxes and Effective Income Tax Rates (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 61   $ 200 $ 17
Effective income tax rate 7.30% 0.00% 4.50% 0.20%