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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details)
$ in Millions
12 Months Ended
Mar. 31, 2017
USD ($)
variable_interest_entity
May 16, 2016
Dec. 31, 2018
USD ($)
securitization
Dec. 31, 2017
securitization
Variable Interest Entity [Line Items]        
Number of securitizations considered non-financing VIEs | securitization       6
Inventory, real estate, construction in process     $ 24.8  
RBDHC        
Variable Interest Entity [Line Items]        
Equity method investment, cumulative percentage ownership after all transactions   100.00%    
Riverchase Landing and The Clusters        
Variable Interest Entity [Line Items]        
Consideration transferred $ 12.5      
VIE, Primary Beneficiary | RBDHC        
Variable Interest Entity [Line Items]        
Variable interest entity, ownership percentage   50.00%    
Impairment of real estate under development     2.8  
VIE, Primary Beneficiary | RBDHC | Other Income        
Variable Interest Entity [Line Items]        
Impairment of real estate under development     2.8  
VIE, Primary Beneficiary | RBDHC | Net Income Attributable to Noncontrolling Interest        
Variable Interest Entity [Line Items]        
Impairment of real estate under development     1.4  
VIE, Primary Beneficiary | RBDHC | Net Loss Attributable to Parent        
Variable Interest Entity [Line Items]        
Impairment of real estate under development     $ 1.4  
Residential Mortgage Loan Securitization        
Variable Interest Entity [Line Items]        
Number of securitizations completed to date | securitization     4  
Financing VIEs, Distressed Residential Mortgage Loan Securitization        
Variable Interest Entity [Line Items]        
Number of securitizations, accounted for as permanent financing | securitization     3  
K-Series | Non-Financing VIEs, Multi-Family CMBS        
Variable Interest Entity [Line Items]        
Number of securitizations not considered non-financing VIEs | securitization     9 7
Number of securitizations considered non-financing VIEs | securitization     8 6
Riverchase Landing and The Clusters        
Variable Interest Entity [Line Items]        
Number of consolidated VIEs | variable_interest_entity 2