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Summary of Information Concerning Indebtedness that Encumbered our Properties (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Debt outstanding Principal $ 888,078 $ 975,531
Unamortized Discount and Debt Issuance Costs (7,497) (8,920)
Indebtedness, net of unamortized discount and deferred financing costs $ 880,581 $ 966,611
Indebtedness, weighted average interest rate 3.50% 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 $ 600,743 $ 545,956
Unamortized Discount and Debt Issuance Costs (3,787) (2,993)
Indebtedness, net of unamortized discount and deferred financing costs $ 596,956 $ 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 (3,316) [1],[2] (4,345) [3]
Indebtedness, net of unamortized discount and deferred financing costs $ 244,019 [1],[2] $ 267,155 [3]
Indebtedness Type [1],[2],[3] Floating  
Indebtedness, weighted average interest rate 2.80% [1],[2] 2.90% [3]
Term Loan    
Debt Instrument [Line Items]    
Debt outstanding Principal [1] $ 40,000  
Unamortized Discount and Debt Issuance Costs [1] (394)  
Indebtedness, net of unamortized discount and deferred financing costs $ 39,606 [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 3 months 18 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 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 [1],[2] 2 years 8 months 12 days [3]
Weighted Average | Term Loan    
Debt Instrument [Line Items]    
Indebtedness maturity (in years) [1] 2 years  
[1] As of September 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 September 30, 2016.
[3] The secured credit facility total capacity was $325,000, of which $271,500 was outstanding as of December 31, 2015.