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Income Taxes - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Income Tax Disclosure [Abstract]      
US tax rate 34.00% 34.00% 34.00%
Effective tax rate 17.00% 11.00% 0.00%