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Summary Information Concerning Indebtedness (Parenthetical) (Detail) - USD ($)
 9 Months Ended
Sep. 30, 2017
May 01, 2017
Dec. 31, 2016
Jun. 24, 2016
Debt Instrument [Line Items]        
Outstanding Principal $ 737,322,000   $ 750,188,000  
Derivative, notional amount 350,000,000   350,000,000  
Unsecured Credit Facility        
Debt Instrument [Line Items]        
Secured credit facility borrowing capacity 300,000,000 $ 300,000,000    
Outstanding Principal [1],[2] 159,690,000      
Secured Credit Facility        
Debt Instrument [Line Items]        
Secured credit facility borrowing capacity     312,500,000  
Outstanding Principal [3]     $ 150,000,000  
Interest Rate Swap        
Debt Instrument [Line Items]        
Derivative, notional amount $ 150,000,000     $ 150,000
Derivative, maturity date Jun. 17, 2021      
Derivative, fixed interest rate 1.1325%      
[1] As of September 30, 2017, 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 1.1325%, has converted $150,000 of our floating rate debt to fixed rate debt.
[2] The unsecured credit facility total capacity is $300,000, of which $159,690 was outstanding as of September 30, 2017.
[3] The secured credit facility total capacity was $312,500, of which $150,000 was outstanding as of December 31, 2016.