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Investment in Unconsolidated Ventures - Additional Information (Detail)
6 Months Ended
Feb. 08, 2018
USD ($)
venture
Jun. 30, 2018
USD ($)
venture
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]        
Gain on sale of assets   $ 4,064,000 $ 103,821,000  
Number of ventures under ownership interest using equity method | venture   6    
Investment in unconsolidated ventures   $ 17,965,000   $ 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    
Starwood Land, L.P.. [Member]        
Schedule of Equity Method Investments [Line Items]        
Number of Equity Method Investments Sold | venture 8      
Starwood Land, L.P.. [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]        
Schedule of Equity Method Investments [Line Items]        
Gain on sale of assets $ 716,000