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Summary of Significant Accounting Policies - Schedule of Carrying Amount and Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets |  |  |  |  |  |
Cash and cash equivalents, Carrying Amount | $ 10,065 |  | $ 20,892 |  | $ 21,924 | $ 38,301
Restricted cash, Carrying Amount | 5,575 |  | 5,518 |  |  |
Derivative assets, Carrying Amount | 4,292 |  | 3,867 |  |  |
Cash and cash equivalents, Estimated Fair Value | 10,065 |  | 20,892 |  |  |
Restricted cash, Estimated Fair Value | 5,575 |  | 5,518 |  |  |
Derivative assets, Estimated Fair Value | 4,292 |  | 3,867 |  |  |
Liabilities |  |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 765,695 |  | 743,817 |  |  |
Secured Credit Facility |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 169,669 | [1],[2] | 147,280 | [3] |  |
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value | 172,000 |  | 150,000 |  |  |
Mortgages |  |  |  |  |  |
Liabilities |  |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 596,026 |  | 596,537 |  |  |
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value | $ 586,100 |  | $ 588,523 |  |  |
[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.

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