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Summary Information Concerning Indebtedness (Parenthetical) (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Outstanding Principal $ 750,188,000 $ 975,531,000
Derivative, notional amount 350,000,000 200,000,000
Interest Rate Swap    
Debt Instrument [Line Items]    
Derivative, notional amount $ 150,000,000  
Derivative, maturity date Jun. 17, 2021  
Derivative, fixed interest rate 1.145%  
Secured Credit Facility    
Debt Instrument [Line Items]    
Secured credit facility borrowing capacity $ 312,500,000 325,000,000
Outstanding Principal $ 150,000,000 [1],[2] $ 271,500,000 [3]
[1] As of December 31, 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 $312,500, of which $150,000 was outstanding as of December 31, 2016.
[3] The secured credit facility total capacity was $325,000, of which $271,500 was outstanding as of December 31, 2015