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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
U.S. federal statutory income tax rate 35.00% 35.00% 35.00%
Income tax benefit related to changes in deferred tax asset valuation allowances   $ 24 $ 102