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Summary Information Concerning Indebtedness (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Outstanding Principal |  | $ 737,322 | $ 750,188
Unamortized Discount and Debt Issuance Costs |  | (5,697) | (6,371)
Carrying Amount |  | $ 731,625 | $ 743,817
Weighted Average Rate |  | 3.50% | 3.60%
Weighted Average |  |  |
Debt Instrument [Line Items] |  |  |
Weighted Average Maturity (in years) |  | 5 years 7 months 6 days | 5 years 8 months 12 days
Unsecured Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding Principal | [1],[2] | $ 159,690 |
Unamortized Discount and Debt Issuance Costs | [1],[2] | (2,527) |
Carrying Amount | [1],[2] | $ 157,163 |
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] | 3 years 10 months 25 days |
Secured Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Outstanding Principal | [3] |  | $ 150,000
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 |  | $ 577,632 | $ 600,188
Unamortized Discount and Debt Issuance Costs |  | (3,170) | (3,651)
Carrying Amount |  | $ 574,462 | $ 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 | 6 years 8 months 12 days
[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 Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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