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Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Outstanding Principal $ 770,500 $ 750,188
Unamortized Discount and Debt Issuance Costs (5,979) (6,371)
Carrying Amount $ 764,521 $ 743,817
Weighted Average Rate 3.50% 3.60%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 8 months 12 days 5 years 8 months 12 days
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal [1],[2] $ 192,190  
Unamortized Discount and Debt Issuance Costs [1],[2] (2,683)  
Carrying Amount $ 189,507 [1],[2] $ 147,280
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] 4 years 1 month 6 days  
Secured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal $ 192,190 150,000 [3]
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 578,310 $ 600,188
Unamortized Discount and Debt Issuance Costs (3,296) (3,651)
Carrying Amount $ 575,014 $ 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 3 months 19 days 6 years 8 months 12 days
[1] As of June 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 secured credit facility total capacity is $300,000, of which $192,190 was outstanding as of June 30, 2017.
[3] The secured credit facility total capacity was $312,500, of which $150,000 was outstanding as of December 31, 2016.