Annual report pursuant to Section 13 and 15(d)

Our Portfolio - Additional Information (Detail)

v3.3.1.900
Our Portfolio - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
May. 31, 2013
Financing Receivable, Recorded Investment [Line Items]        
Financing receivables, investments, real estate and equity method investments $ 1,348,000,000      
Deferred funding obligations 108,499,000 $ 88,288,000    
Loan expected recovery 800,000      
Charged off of receivable against allowance 1,200,000 9,800,000    
Allowance for credit losses 0 1,000,000    
Accrued interest income     $ 2,400,000  
Other financing receivables on non accrual status 0 0 0  
Loan modifications that qualify as trouble debt restructurings 0 $ 0 0  
Energy Source LLC [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Recovered of loan outstanding balance 800,000      
Energy Source LLC [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Financing receivable allowance     11,000,000  
Financing receivable allowance, face amount       $ 24,000,000
Financial receivable average outstanding balance $ 11,800,000   $ 24,700,000  
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 2080