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Summary of Significant Accounting Policies - Consolidated Entities (Details) - VIE, Primary Beneficiary		9 Months Ended
	Mar. 01, 2018	Sep. 30, 2018
1455 Market
Variable Interest Entity [Line Items]
Ownership Interest		55.00%
Hill7
Variable Interest Entity [Line Items]
Ownership Interest		55.00%
HPP-MAC WSP, LLC
Variable Interest Entity [Line Items]
Ownership Interest	75.00%	75.00%

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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

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=108788376&loc=SL6759159-111685

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