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Investment in Unconsolidated Ventures - Summarized Income Statement Information additional information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Deferred Gain on Sale $ 1,496  
Unrecognized basis difference on equity method investment 588  
Equity Method Investments [Member]    
Schedule of Equity Method Investments [Line Items]    
Long-term Debt, Current Maturities 72,637 $ 65,795
Equity Method Investments [Member] | Non-recourse Debt [Member]    
Schedule of Equity Method Investments [Line Items]    
Long-term Debt, Current Maturities $ 40,902 $ 42,566