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Indebtedness - Additional Information (Detail) |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 26, 2017 USD ($) Property | May 01, 2017 USD ($) | Sep. 30, 2017 USD ($) Property | Jun. 30, 2017 USD ($) | May 31, 2017 USD ($) | Feb. 28, 2017 USD ($) | Sep. 30, 2017 USD ($) Property | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ (572,000) |  |  |  |  | $ (572,000) | $ (558,000) |
Proceeds from credit facility | $ 85,000,000 |  |  | $ 31,250,000 | $ 9,000,000 |  | $ 148,190,000 | $ 93,501,000 |
Number of properties acquired | Property | 4 |  |  |  |  |  |  |  |
Number of property dispositions | Property |  |  | 3 |  |  |  | 3 |  |
Defeasance mortgage loan related to property disposition |  |  |  |  |  |  | $ 20,586,000 |  |
Secured Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from credit facility |  |  |  |  |  | $ 22,000,000 |  |  |
Unsecured credit facility |  |  |  |  |  |  |  |  | $ 312,500,000
Maturity date |  | Sep. 17, 2018 |  |  |  |  |  |  |
Unsecured Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured credit facility |  | $ 300,000,000 | $ 300,000,000 |  |  |  | $ 300,000,000 |  |
Paid down value on unsecured credit facility |  |  | $ 117,500,000 |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured credit facility |  | $ 50,000,000 |  |  |  |  |  |  |
Maturity date |  | May 01, 2022 |  |  |  |  |  |  |
Term Loan | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate |  | 1.45% |  |  |  |  |  |  |
Revolving Commitment |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Unsecured credit facility |  | $ 250,000,000 |  |  |  |  |  |  |
Maturity date |  | May 01, 2021 |  |  |  |  |  |  |
Revolving Commitment | LIBOR |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt interest rate |  | 1.50% |  |  |  |  |  |  |

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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