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Summary of Information Concerning Indebtedness that Encumbered our Properties (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Debt outstanding Principal |  | $ 888,382 |  | $ 975,531 |
Unamortized Discount and Debt Issuance Costs |  | (8,094) |  | (8,920) |
Indebtedness, net of unamortized discount and deferred financing costs |  | $ 880,288 |  | $ 966,611 |
Indebtedness, weighted average interest rate |  | 3.60% |  | 3.70% |
Bridge Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt outstanding Principal |  |  |  | $ 120,000 |
Unamortized Discount and Debt Issuance Costs |  |  |  | (1,582) |
Indebtedness, net of unamortized discount and deferred financing costs |  |  |  | $ 118,418 |
Indebtedness Type |  | Floating |  |  |
Indebtedness, weighted average interest rate |  |  |  | 5.40% |
Mortgages-Fixed Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt outstanding Principal |  | $ 601,047 |  | $ 545,956 |
Unamortized Discount and Debt Issuance Costs |  | (3,922) |  | (2,993) |
Indebtedness, net of unamortized discount and deferred financing costs |  | $ 597,125 |  | $ 542,963 |
Indebtedness Type |  | Fixed |  |  |
Indebtedness, weighted average interest rate |  | 3.80% |  | 3.80% |
Mortgages-Floating Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt outstanding Principal |  | $ 0 |  | $ 38,075 |
Indebtedness, net of unamortized discount and deferred financing costs |  |  |  | $ 38,075 |
Indebtedness Type |  | Floating |  |  |
Indebtedness, weighted average interest rate |  |  |  | 2.80% |
Secured Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt outstanding Principal |  | $ 247,335 | [1],[2] | $ 271,500 | [3]
Unamortized Discount and Debt Issuance Costs |  | (3,731) | [1],[2] | (4,345) | [3]
Indebtedness, net of unamortized discount and deferred financing costs |  | $ 243,604 | [1],[2] | $ 267,155 | [3]
Indebtedness Type | [1],[2],[3] | Floating |  |  |
Indebtedness, weighted average interest rate |  | 2.90% | [1],[2] | 2.90% | [3]
Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt outstanding Principal | [1] | $ 40,000 |  |  |
Unamortized Discount and Debt Issuance Costs | [1] | (441) |  |  |
Indebtedness, net of unamortized discount and deferred financing costs |  | $ 39,559 | [1] | $ 118,418 |
Indebtedness Type | [1] | Floating |  |  |
Indebtedness, weighted average interest rate | [1] | 4.50% |  |  |
Weighted Average |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Indebtedness maturity (in years) |  | 5 years 7 months 6 days |  | 4 years 10 months 24 days |
Weighted Average | Bridge Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Indebtedness maturity (in years) |  |  |  | 8 months 12 days |
Weighted Average | Mortgages-Fixed Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Indebtedness maturity (in years) |  | 7 years 2 months 12 days |  | 6 years 10 months 24 days |
Weighted Average | Mortgages-Floating Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Indebtedness maturity (in years) |  |  |  | 5 years 4 months 24 days |
Weighted Average | Secured Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Indebtedness maturity (in years) |  | 2 years 2 months 12 days | [1],[2] | 2 years 8 months 12 days | [3]
Weighted Average | Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Indebtedness maturity (in years) | [1] | 2 years 2 months 12 days |  |  |
[1] | As of June 30, 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 $325,000, of which $247,335 was outstanding as of June 30, 2016.
[3] | The secured credit facility total capacity was $325,000, of which $271,500 was outstanding as of December 31, 2015.

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