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Summary Information Concerning Indebtedness (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Outstanding Principal $ 771,553 $ 750,188
Unamortized Discount and Debt Issuance Costs (5,858) (6,371)
Carrying Amount $ 765,695 $ 743,817
Weighted Average Rate 3.60% 3.60%
Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 5 years 3 months 18 days 5 years 8 months 12 days
Secured Credit Facility    
Debt Instrument [Line Items]    
Outstanding Principal $ 172,000 [1],[2] $ 150,000 [3]
Unamortized Discount and Debt Issuance Costs (2,331) [1],[2] (2,720) [3]
Carrying Amount $ 169,669 [1],[2] $ 147,280 [3]
Type Floating [1],[2] Floating [3]
Weighted Average Rate 2.80% [1],[2] 3.00% [3]
Secured Credit Facility | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 1 year 6 months [1],[2] 1 year 8 months 12 days [3]
Mortgages-Fixed Rate    
Debt Instrument [Line Items]    
Outstanding Principal $ 599,553 $ 600,188
Unamortized Discount and Debt Issuance Costs (3,527) (3,651)
Carrying Amount $ 596,026 $ 596,537
Type Fixed Fixed
Weighted Average Rate 3.80% 3.80%
Mortgages-Fixed Rate | Weighted Average    
Debt Instrument [Line Items]    
Weighted Average Maturity (in years) 6 years 6 months 6 years 8 months 12 days
[1] As of March 31, 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 1.145%, 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 $172,000 was outstanding as of March 31, 2017.
[3] The secured credit facility total capacity was $312,500, of which $150,000 was outstanding as of December 31, 2016.