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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Taxes [Line Items]        
Income taxes (benefit) expense $ (393) $ (160) $ (685) $ 856
Effective tax rate     (339.10%) 27.00%