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Lease Intangibles - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Below market rents, acquired	$ 4.9	$ 10.9
Below market rents acquired, weighted average useful life	21 years 7 months 6 days	12 years 1 month 6 days
Above-market ground lease, acquired		$ 0.7
Above-market ground lease acquired, weighted average useful life		11 years 6 months
In-place lease intangible assets
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 12.4	$ 41.6
Acquired intangible assets, weighted average useful life	4 years 3 months 18 days	4 years 1 month 6 days
Above-market rent
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 1.0	$ 2.7
Acquired intangible assets, weighted average useful life	1 year 8 months 12 days	4 years 9 months 18 days

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- Definition

Above-market ground lease, acquired.

+ References

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- Definition

Above-market ground lease acquired, weighted average useful life.

+ References

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- Definition

Below market lease acquired weighted average useful life.

+ References

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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

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- Definition

Amount of acquired leases acquired as part of a real property acquisition at below market lease rate with a finite life.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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)
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