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Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Outstanding Principal $ 750,188 $ 975,531
Unamortized Discount and Debt Issuance Costs (6,371) (8,920)
Carrying Amount $ 743,817 $ 966,611
Weighted Average Rate 3.60% 3.70%
Bridge Term Loan    
Debt Instrument [Line Items]    
Outstanding Principal   $ 120,000
Unamortized Discount and Debt Issuance Costs   (1,582)
Carrying Amount   $ 118,418
Type Floating  
Weighted Average Rate   5.40%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 8 months 12 days 4 years 10 months 24 days
Weighted Average | Bridge Term Loan    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years)   8 months 12 days
Mortgages-Fixed Rate    
Debt Instrument [Line Items]    
Outstanding Principal $ 600,188 $ 545,956
Unamortized Discount and Debt Issuance Costs (3,651) (2,993)
Carrying Amount $ 596,537 $ 542,963
Type Fixed  
Weighted Average Rate 3.80% 3.80%
Mortgages-Fixed Rate | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 6 years 8 months 12 days 6 years 10 months 24 days
Mortgages-Floating Rate    
Debt Instrument [Line Items]    
Outstanding Principal $ 0 $ 38,075
Carrying Amount   $ 38,075
Type Floating  
Weighted Average Rate   2.80%
Mortgages-Floating Rate | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years)   5 years 4 months 24 days
Secured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal $ 150,000 [1],[2] $ 271,500 [3]
Unamortized Discount and Debt Issuance Costs (2,720) [1],[2] (4,345) [3]
Carrying Amount $ 147,280 [1],[2] $ 267,155 [3]
Type [1],[2] Floating  
Weighted Average Rate 3.00% [1],[2] 2.90% [3]
Secured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 1 year 8 months 12 days [1],[2] 2 years 8 months 12 days [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