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Borrowing Arrangements - Additional Information (Detail) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2018 Property | Mar. 31, 2018 loan | Mar. 31, 2018 property | Mar. 31, 2018 | Mar. 31, 2018 Rate | Dec. 31, 2017 USD ($) 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 | 2,491,400 |  |  |  |  |  | $ 2,323,100
Mortgage notes payable, net | 2,040,506 |  |  |  |  |  | $ 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) |  |  |  |  | 3.10% |  |
Secured Debt | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate (in percentage) |  |  |  |  | 8.90% |  |
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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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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