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Mortgage Loans on Real Estate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mortgage Loans On Real Estate [Line Items]        
Prior Liens $ 617,352      
Face Amount of Mortgages 402,174      
Carrying Amount of Mortgages 209,566 $ 297,451 $ 442,826 $ 437,144
Principal Amount of Loans Subject to Delinquent Principal or Interest 0      
Mezzanine Loans [Member] | Retail [Member]        
Mortgage Loans On Real Estate [Line Items]        
Prior Liens 63,548      
Face Amount of Mortgages 19,540      
Carrying Amount of Mortgages 19,675      
Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0      
Mezzanine Loans [Member] | Retail [Member] | Borrower A [Member]        
Mortgage Loans On Real Estate [Line Items]        
Interest Rate 9.00%      
Final Maturity Date 2023-06      
Periodic Payment Terms I      
Prior Liens $ 20,004      
Face Amount of Mortgages 7,500      
Carrying Amount of Mortgages 7,541      
Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0      
Mezzanine Loans [Member] | Retail [Member] | Borrower B [Member]        
Mortgage Loans On Real Estate [Line Items]        
Interest Rate 9.00%      
Final Maturity Date 2019-06      
Periodic Payment Terms I      
Prior Liens $ 43,544      
Face Amount of Mortgages 12,040      
Carrying Amount of Mortgages 12,134      
Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0      
Investments in and Advances to Joint Ventures [Member] | Borrower C [Member]        
Mortgage Loans On Real Estate [Line Items]        
Interest Rate 8.50%      
Final Maturity Date 2021-10      
Periodic Payment Terms QI      
Prior Liens $ 390,417      
Face Amount of Mortgages 300,000      
Carrying Amount of Mortgages 135,759      
Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0      
Investments in and Advances to Joint Ventures [Member] | Borrower D [Member]        
Mortgage Loans On Real Estate [Line Items]        
Interest Rate 8.50%      
Final Maturity Date 2022-12      
Periodic Payment Terms QI      
Prior Liens $ 163,387      
Face Amount of Mortgages 82,634      
Carrying Amount of Mortgages 54,132      
Principal Amount of Loans Subject to Delinquent Principal or Interest $ 0