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Balance of Investment in Joint Venture (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Capital contributions $ 3,856 $ 3,856
Equity in cumulative net loss (3,856) (3,856)
Investment in joint venture $ 0 $ 0