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Lease Intangibles - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Below market rents, acquired | $ 9.5 | $ 7.9
Below market rents acquired, weighted average useful life | 23 years 4 months 24 days | 20 years 6 months
In-place lease intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets acquired | $ 31.4 | $ 24.2
Acquired intangible assets, weighted average useful life | 8 years 6 months | 5 years 2 months 12 days
Above-market rent |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets acquired | $ 0.5 | $ 2.5
Acquired intangible assets, weighted average useful life | 6 years 8 months 12 days | 5 years 1 month 6 days

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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