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Summary of Significant Accounting Policies - Schedule of Carrying Amount and Fair Value (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Assets |  |  |  |  |
Cash and cash equivalents, Carrying Amount | $ 10,896 |  | $ 9,985 |  | $ 6,271
Restricted cash, Carrying Amount | 7,051 |  | 4,634 |  |
Derivative assets, Carrying Amount | 11,755 |  | 7,291 |  |
Cash and cash equivalents, Estimated Fair Value | 10,896 |  | 9,985 |  |
Restricted cash, Estimated Fair Value | 7,051 |  | 4,634 |  |
Derivative assets, Estimated Fair Value | 11,755 |  | 7,291 |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 911,772 |  | 778,442 |  |
Unsecured Credit Facility |  |  |  |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 196,949 | [1] | 101,629 | [2] |
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value | 199,005 |  | 104,005 |  |
Term Loan |  |  |  |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 99,130 |  | 99,105 |  |
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value | 100,000 |  | 100,000 |  |
Mortgages |  |  |  |  |
Liabilities |  |  |  |  |
Indebtedness, net of unamortized discount and deferred financing costs | 615,693 |  | 577,708 |  |
Indebtedness, net of unamortized discount and deferred financing costs, estimated fair value | $ 598,217 |  | $ 564,333 |  |
[1] | The unsecured credit facility total capacity is $300,000, of which $199,005 was outstanding as of June 30, 2018.
[2] | The unsecured credit facility total capacity was $300,000, of which $104,005 was outstanding as of December 31, 2017.

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