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Summary of Total Recourse and Non-Recourse Indebtedness (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Indebtedness $ 3,267,230 $ 3,328,082
Unpaid Principal Balance $ 3,324,228 $ 3,390,023
Weighted-Average Interest Rate 3.10% 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 492,129 543,080
Unpaid Principal Balance $ 495,253 $ 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 $ 855,555 $ 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]    
Stated interest rate 0.43725% 0.4295%
Interest rate at LIBOR plus basis rate 2.45% 2.45%
Debt instrument, description of variable rate basis 1-month LIBOR  
CMBS Facilities    
Debt Instrument [Line Items]    
Indebtedness $ 1,358,687 $ 1,388,194
Term Loans | London Interest Bank Offer Rate    
Debt Instrument [Line Items]    
Stated interest rate 0.43725% 0.4295%
Interest rate at LIBOR plus basis rate 5.00% 5.00%
Debt instrument, description of variable rate basis 1-month LIBOR  
Other indebtedness    
Debt Instrument [Line Items]    
Indebtedness [1] $ 24,595  
Unpaid Principal Balance [1] $ 24,321  
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 $ 201  
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 $201 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.