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Summary of Significant Accounting Policies - Schedule of Carrying Amount and Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets |  |  |  |  |
Cash and cash equivalents, Carrying Amount | $ 6,271 |  | $ 20,892 | $ 28,051 | $ 38,301
Restricted cash, Carrying Amount | 5,690 |  | 5,518 |  |
Derivative assets, Carrying Amount | 3,619 |  | 3,867 |  |
Cash and cash equivalents, Estimated Fair Value | 6,271 |  | 20,892 |  |
Restricted cash, Estimated Fair Value | 5,690 |  | 5,518 |  |
Derivative assets, Estimated Fair Value | 3,619 |  | 3,867 |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 764,521 |  | 743,817 |  |
Unsecured Credit Facility |  |  |  |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 189,507 | [1],[2] | 147,280 |  |
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value | 192,190 |  | 150,000 |  |
Mortgages |  |  |  |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 575,014 |  | 596,537 |  |
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value | $ 566,073 |  | $ 588,523 |  |
[1] | As of June 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 secured credit facility total capacity is $300,000, of which $192,190 was outstanding as of June 30, 2017.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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