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Joint Venture - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]    
Partnership formation date   Jul. 24, 2015
Percentage of Interest in partnership   49.00%
Loss from partnership venture $ (300) $ (325)