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Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Outstanding Principal $ 737,322 $ 750,188
Unamortized Discount and Debt Issuance Costs (5,697) (6,371)
Carrying Amount $ 731,625 $ 743,817
Weighted Average Rate 3.50% 3.60%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 7 months 6 days 5 years 8 months 12 days
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal [1],[2] $ 159,690  
Unamortized Discount and Debt Issuance Costs [1],[2] (2,527)  
Carrying Amount [1],[2] $ 157,163  
Type [1],[2] Floating  
Weighted Average Rate [1],[2] 2.70%  
Unsecured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) [1],[2] 3 years 10 months 25 days  
Secured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal [3]   $ 150,000
Unamortized Discount and Debt Issuance Costs [3]   (2,720)
Carrying Amount [3]   $ 147,280
Type [3]   Floating
Weighted Average Rate [3]   3.00%
Secured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) [3]   1 year 8 months 12 days
Mortgages-Fixed Rate    
Debt Instrument [Line Items]    
Outstanding Principal $ 577,632 $ 600,188
Unamortized Discount and Debt Issuance Costs (3,170) (3,651)
Carrying Amount $ 574,462 $ 596,537
Type Fixed Fixed
Weighted Average Rate 3.70% 3.80%
Mortgages-Fixed Rate | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 6 years 6 years 8 months 12 days
[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.