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Real Estate and Loans Receivable - Concentration of Credit Risks and Related Party Transactions - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Investment
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Investment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Business Acquisition [Line Items]                      
Revenues $ 131,546 $ 114,570 $ 99,801 $ 95,961 $ 82,106 $ 80,777 $ 76,560 $ 73,089 $ 441,878 $ 312,532 $ 242,523
European [Member]                      
Business Acquisition [Line Items]                      
Revenues                 83,000 26,000  
Related Party Transactions [Member]                      
Business Acquisition [Line Items]                      
Lease and interest revenue earned from tenants                 $ 215,400 $ 101,800 $ 70,000
Assets, Total [Member] | Customer Concentration Risk [Member]                      
Business Acquisition [Line Items]                      
Number of investment in property | Investment 0               0    
Maximum percentage of entity's total assets invested on single property 2.00%               2.00%    
Assets, Total [Member] | Geographic Concentration Risk [Member] | United States [Member]                      
Business Acquisition [Line Items]                      
Percentage of total assets accounted                 80.00%    
Assets, Total [Member] | Geographic Concentration Risk [Member] | European [Member]                      
Business Acquisition [Line Items]                      
Percentage of total assets accounted                 20.00%