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Summary of Total Recourse and Non-Recourse Indebtedness (Parenthetical) (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Apr. 30, 2016
Debt Instrument [Line Items]      
Indebtedness $ 3,005,259 $ 3,328,082 $ 17,696
Unpaid Principal Balance $ 3,055,452 $ 3,390,023  
Weighted-Average Interest Rate 3.20% 3.00%  
Proceeds from issuance of joint venture interests accounted for as indebtedness $ 24,796    
Consolidation Eliminations      
Debt Instrument [Line Items]      
Indebtedness   $ 815,745  
IRT      
Debt Instrument [Line Items]      
Indebtedness 597,125 543,080  
Unpaid Principal Balance $ 601,047 $ 545,956  
Weighted-Average Interest Rate 3.80% 3.80%  
Minimum | IRT      
Debt Instrument [Line Items]      
Contractual Maturity, month and year 2021-01 2016-04  
Maximum | IRT      
Debt Instrument [Line Items]      
Contractual Maturity, month and year 2025-05 2025-05  
CMBS securitizations      
Debt Instrument [Line Items]      
Indebtedness $ 772,557 $ 885,055  
7.0% convertible senior notes      
Debt Instrument [Line Items]      
Stated interest rate 7.00% 7.00%  
4.0% convertible senior notes      
Debt Instrument [Line Items]      
Stated interest rate 4.00% 4.00%  
Secured credit facilities | London Interest Bank Offer Rate      
Debt Instrument [Line Items]      
Interest rate at LIBOR plus basis rate 2.45% 2.45%  
Debt instrument, description of variable rate basis 1-month LIBOR    
Term Loans | London Interest Bank Offer Rate      
Debt Instrument [Line Items]      
Interest rate at LIBOR plus basis rate 4.00% 5.00%  
Debt instrument, description of variable rate basis 1-month LIBOR    
CMBS Facilities      
Debt Instrument [Line Items]      
Indebtedness $ 1,219,408 $ 1,388,194  
Other indebtedness      
Debt Instrument [Line Items]      
Indebtedness [1] 24,521    
Unpaid Principal Balance [1] $ 24,796    
Percentage of interest issued to unaffiliated third party 40.00%    
Proceeds from issuance of joint venture interests accounted for as indebtedness $ 24,796    
Payment of debt issuance costs $ 275    
Interest owned in joint venture 60.00%    
[1] Represents a 40% interest issued to an unaffiliated third party in a venture to which we contributed the junior notes and equity of a floating rate securitization. We retained a 60% interest in this venture, and, as a result of our controlling financial interest, we consolidated the venture. We received $24,796 of proceeds as a result of issuing this 40% interest and incurred $275 of costs with third parties. This 40% interest has no stated maturity date and does not provide for its mandatory redemption or any required return or interest payment. The venture interests allocate the distributions on such junior notes and equity when made between the parties to the venture.