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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
Income Taxes [Line Items]        
Income taxes expense $ 1,643 $ 0 $ 958 $ 856
Effective tax rate     19.00% 21.00%