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Balance of Investment in Joint Venture (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Capital Contributions, net of distributions $ 5,155 $ 3,420
Equity in cumulative net loss (1,093) (259)
Investment in joint venture $ 4,062 $ 3,161 [1]
[1] Derived from audited financial statements