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Balance of Investment in Joint Venture (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Capital Contributions, net of distributions $ 5,204 $ 3,420
Equity in cumulative net loss (3,158) (259)
Investment in joint venture $ 2,046 $ 3,161 [1]
[1] Derived from audited financial statements