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Mortgage Notes Payable and Credit Facility - Interest Rate Cap Agreement (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Aggregate cost | $ 482 |
Notional amount | 93,920 | $ 71,721
Fair value | $ 49 | $ 101
Minimum | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 2.50% |
Maximum | LIBOR |  |
Debt Instrument [Line Items] |  |
Interest rate (as percent) | 3.00% |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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- Definition Fair value of all derivatives designated as interest rate fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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