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Investment in Unconsolidated Ventures - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2018
USD ($)
venture
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]      
Number of Equity Method Investments Sold | venture 8    
Gain on sale of assets $ 2,746,000 $ 74,215,000  
Number of ventures under ownership interest using equity method | venture 6    
Investment in unconsolidated ventures $ 17,284,000   $ 64,579,000
Variable Interest Entity, Not Primary Beneficiary [Member]      
Schedule of Equity Method Investments [Line Items]      
Proceeds from Sales of Assets, Investing Activities 11,049,000    
Gain on sale of assets $ 2,030,000    
Variable Interest Entity, Primary Beneficiary      
Schedule of Equity Method Investments [Line Items]      
Number of ventures that are a VIE | venture 0