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Borrowing Arrangements - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 Property | Jun. 30, 2018 loan | Jun. 30, 2018 property | Jun. 30, 2018 | Jun. 30, 2018 Rate | Dec. 31, 2017 USD ($) Property
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of loans | loan |  |  |  | 1 |  |  |  |
Number of pledged properties |  |  | 124 |  | 2 |  |  | 120
Proceeds from loans |  | $ 64,000 |  |  |  |  |  |
Stated interest rate (in percentage) |  |  |  |  |  | 4.83% |  |
Pledged assets, not separately reported |  | 2,499,000 |  |  |  |  |  | $ 2,323,100
Mortgage notes payable, net |  | 2,028,535 |  |  |  |  |  | $ 1,971,715
Weighted average interest rate (percentage) | Rate |  |  |  |  |  |  | 4.70% |
Repayments of unsecured line of credit |  | $ 30,000 |  |  |  |  |  |
Secured Debt | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (in percentage) |  |  |  |  |  | 3.05% |  |
Secured Debt | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate (in percentage) |  |  |  |  |  | 8.87% |  |
Serendipity |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from loans | $ 8,800 |  |  |  |  |  |  |
Stated interest rate (in percentage) | 4.75% |  |  |  |  |  |  |
Liabilities incurred | $ 9,200 |  |  |  |  |  |  |
Pledged assets, not separately reported | $ 18,000 |  |  |  |  |  |  |

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