Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Additional Information (Detail)

v3.3.0.814
Our Portfolio - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]            
Financing receivables, investments, real estate and equity method investments $ 1,100,000,000 $ 1,100,000,000   $ 1,100,000,000    
Deferred funding obligations 78,436,000 78,436,000   78,436,000   $ 88,288,000
Restricted cash 0 0   0   3,000,000
Charged off of receivable against allowance       1,200,000    
Allowance for credit losses 0 0   0   1,000,000
Other financing receivables on non accrual status $ 0 0   0   $ 0
Provision for credit losses   0 $ 0 0 $ 0  
Loan modifications that qualify as trouble debt restructurings   $ 0 $ 0      
Energy Source LLC [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Recovered of loan outstanding balance       $ 800,000    
Credit Concentration Risk [Member] | Debt and Real Estate Portfolio [Member]            
Financing Receivable, Recorded Investment [Line Items]            
% of Debt and Real Estate Portfolio 99.00%          
Minimum [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Long-term triple net leases expiration dates range       2033    
Long-term triple net leases extended expiration dates range       2047    
Maximum [Member]            
Financing Receivable, Recorded Investment [Line Items]            
Long-term triple net leases expiration dates range       2045    
Long-term triple net leases extended expiration dates range       2061