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Income Taxes - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
US tax rate 34.00% 34.00% 34.00% 34.00%
Effective tax rate 24.00% (17.00%) 0.00% (11.00%)