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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]            
OP Units to common stock, conversion ratio       1    
Marketable equity securities       $ 26,754 $ 35,600  
Carried interest and incentive compensation       12,181 0 $ 0
Net income attributable to noncontrolling interests in investment entities       $ 67,994 129,996 $ 163,084
Minimum            
Property, Plant and Equipment [Line Items]            
Lag period for recording proportionate share of income for equity method investments       1 month    
Maximum            
Property, Plant and Equipment [Line Items]            
Lag period for recording proportionate share of income for equity method investments       3 months    
Building, Fee Interest | Minimum            
Property, Plant and Equipment [Line Items]            
Estimated useful life       15 years    
Building, Fee Interest | Maximum            
Property, Plant and Equipment [Line Items]            
Estimated useful life       45 years    
Land Improvements | Minimum            
Property, Plant and Equipment [Line Items]            
Estimated useful life       6 years    
Land Improvements | Maximum            
Property, Plant and Equipment [Line Items]            
Estimated useful life       20 years    
Furniture, Fixtures and Equipment | Minimum            
Property, Plant and Equipment [Line Items]            
Estimated useful life       3 years    
Furniture, Fixtures and Equipment | Maximum            
Property, Plant and Equipment [Line Items]            
Estimated useful life       20 years    
Furniture, Fixtures, Equipment and Capitalized Software | Minimum            
Property, Plant and Equipment [Line Items]            
Estimated useful life       3 years    
Furniture, Fixtures, Equipment and Capitalized Software | Maximum            
Property, Plant and Equipment [Line Items]            
Estimated useful life       5 years    
Aircraft            
Property, Plant and Equipment [Line Items]            
Estimated useful life       15 years    
Incentive fees ($5,445, $172, $0 from affiliates, respectively) | Minimum            
Property, Plant and Equipment [Line Items]            
Percent of fees allocated to employees       40.00%    
Incentive fees ($5,445, $172, $0 from affiliates, respectively) | Maximum            
Property, Plant and Equipment [Line Items]            
Percent of fees allocated to employees       50.00%    
Scenario, Adjustment            
Property, Plant and Equipment [Line Items]            
Marketable equity securities         $ 35,600  
Carried interest and incentive compensation $ 3,500 $ 1,100 $ 900      
Net income attributable to noncontrolling interests in investment entities $ 3,500 $ 1,100 $ 900