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Balance of Investment in Joint Venture (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Capital contributions, net of distributions $ 3,509 $ 4,188
Equity in cumulative net loss (3,509) (4,170)
Investment in joint venture $ 0 $ 18 [1]
[1] Derived from audited financial statements