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Summary Information Concerning Indebtedness (Parenthetical) (Detail) - USD ($) | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | May 01, 2017 | Dec. 31, 2016 | Jun. 24, 2016
Debt Instrument [Line Items] |  |  |  |  |
Outstanding Principal |  | $ 737,322,000 |  | $ 750,188,000 |
Derivative, notional amount |  | 350,000,000 |  | 350,000,000 |
Unsecured Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured credit facility borrowing capacity |  | 300,000,000 | $ 300,000,000 |  |
Outstanding Principal | [1],[2] | 159,690,000 |  |  |
Secured Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured credit facility borrowing capacity |  |  |  | 312,500,000 |
Outstanding Principal | [3] |  |  | $ 150,000,000 |
Interest Rate Swap |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Derivative, notional amount |  | $ 150,000,000 |  |  | $ 150,000
Derivative, maturity date |  | Jun. 17, 2021 |  |  |
Derivative, fixed interest rate |  | 1.1325% |  |  |
[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.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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