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Income Taxes - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]        
Uncertain tax positions or unrecognized tax benefits   $ 0 $ 0 $ 0
Accrued interest and penalty $ 0 0 $ 0  
Valuation Allowance 0 $ 0    
Undistributed earnings of foreign subsidiaries 623,000      
Unrecognized deferred tax liability from undistributed earnings of foreign subsidiaries $ 242,000