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Summary of Significant Accounting Policies - Schedule of Carrying Amount and Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Assets |  |  |  |  |
Cash and cash equivalents, Carrying Amount | $ 8,653 |  | $ 8,751 |  | $ 57,436
Restricted cash, Carrying Amount | 4,449 |  | 4,864 |  |
Derivative assets, Carrying Amount | 2,810 |  |  |  |
Cash and cash equivalents, Estimated Fair Value | 8,653 |  | 8,751 |  |
Restricted cash, Estimated Fair Value | 4,449 |  | 4,864 |  |
Derivative assets, Estimated Fair Value | 2,810 |  |  |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs, Carrying Amount | 947,631 |  | 945,686 |  |
Derivative liabilities, carrying Amount | 19,540 |  | 29,842 |  |
Derivative liabilities, Estimated Fair Value | 19,540 |  | 29,842 |  |
Unsecured Credit Facility |  |  |  |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs, Carrying Amount | 192,782 | [1] | 183,110 | [2] |
Indebtedness, net of unamortized discount and deferred financing costs, Estimated Fair Value | 194,302 |  | 184,802 |  |
Term Loan |  |  |  |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs, Carrying Amount | 298,846 |  | 298,759 |  |
Indebtedness, net of unamortized discount and deferred financing costs, Estimated Fair Value | 300,000 |  | 300,000 |  |
Mortgages |  |  |  |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs, Carrying Amount | 456,003 |  | 463,817 |  |
Indebtedness, net of unamortized discount and deferred financing costs, Estimated Fair Value | $ 470,234 |  | $ 479,929 |  |
[1] | The unsecured credit facility total capacity is $350,000, of which $194,302 was outstanding as of March 31, 2021.
[2] | The unsecured credit facility total capacity was $350,000, of which $184,802 was outstanding as of December 31, 2020.

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