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Summary of Information Concerning Indebtedness that Encumbered our Properties (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Debt outstanding Principal $ 888,382 $ 975,531
Unamortized Discount and Debt Issuance Costs (8,094) (8,920)
Indebtedness, net of unamortized discount and deferred financing costs $ 880,288 $ 966,611
Indebtedness, weighted average interest rate 3.60% 3.70%
Bridge Term Loan    
Debt Instrument [Line Items]    
Debt outstanding Principal   $ 120,000
Unamortized Discount and Debt Issuance Costs   (1,582)
Indebtedness, net of unamortized discount and deferred financing costs   $ 118,418
Indebtedness Type Floating  
Indebtedness, weighted average interest rate   5.40%
Mortgages-Fixed Rate    
Debt Instrument [Line Items]    
Debt outstanding Principal $ 601,047 $ 545,956
Unamortized Discount and Debt Issuance Costs (3,922) (2,993)
Indebtedness, net of unamortized discount and deferred financing costs $ 597,125 $ 542,963
Indebtedness Type Fixed  
Indebtedness, weighted average interest rate 3.80% 3.80%
Mortgages-Floating Rate    
Debt Instrument [Line Items]    
Debt outstanding Principal $ 0 $ 38,075
Indebtedness, net of unamortized discount and deferred financing costs   $ 38,075
Indebtedness Type Floating  
Indebtedness, weighted average interest rate   2.80%
Secured Credit Facility    
Debt Instrument [Line Items]    
Debt outstanding Principal $ 247,335 [1],[2] $ 271,500 [3]
Unamortized Discount and Debt Issuance Costs (3,731) [1],[2] (4,345) [3]
Indebtedness, net of unamortized discount and deferred financing costs $ 243,604 [1],[2] $ 267,155 [3]
Indebtedness Type [1],[2],[3] Floating  
Indebtedness, weighted average interest rate 2.90% [1],[2] 2.90% [3]
Term Loan    
Debt Instrument [Line Items]    
Debt outstanding Principal [1] $ 40,000  
Unamortized Discount and Debt Issuance Costs [1] (441)  
Indebtedness, net of unamortized discount and deferred financing costs $ 39,559 [1] $ 118,418
Indebtedness Type [1] Floating  
Indebtedness, weighted average interest rate [1] 4.50%  
Weighted Average    
Debt Instrument [Line Items]    
Indebtedness maturity (in years) 5 years 7 months 6 days 4 years 10 months 24 days
Weighted Average | Bridge Term Loan    
Debt Instrument [Line Items]    
Indebtedness maturity (in years)   8 months 12 days
Weighted Average | Mortgages-Fixed Rate    
Debt Instrument [Line Items]    
Indebtedness maturity (in years) 7 years 2 months 12 days 6 years 10 months 24 days
Weighted Average | Mortgages-Floating Rate    
Debt Instrument [Line Items]    
Indebtedness maturity (in years)   5 years 4 months 24 days
Weighted Average | Secured Credit Facility    
Debt Instrument [Line Items]    
Indebtedness maturity (in years) 2 years 2 months 12 days [1],[2] 2 years 8 months 12 days [3]
Weighted Average | Term Loan    
Debt Instrument [Line Items]    
Indebtedness maturity (in years) [1] 2 years 2 months 12 days  
[1] As of June 30, 2016, IRT maintained a float-to-fixed interest rate swap with a $ 150,000 notional amount. This swap, which expires on June 17, 2021 and has a fixed rate of 1.145%, has converted $ 150,000 of our floating rate debt to fixed rate debt.
[2] The secured credit facility total capacity is $325,000, of which $247,335 was outstanding as of June 30, 2016.
[3] The secured credit facility total capacity was $325,000, of which $271,500 was outstanding as of December 31, 2015.