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Income Taxes - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Deferred tax assets, gross     $ 51,028,000
Income tax benefits / expense $ 0 $ 0  
Increase in gross deferred tax assets 10,000,000    
Unrecognized tax benefits 0   0
Accrued interest or tax penalties $ 0   $ 0
Income tax earliest examination year 2012