Commitments and Contingencies - Additional Information (Details)	6 Months Ended
Jun. 30, 2017 ft²
Other Commitments [Line Items]
Area of office properties	11,800,000
718 Fifth Avenue [Member]
Other Commitments [Line Items]
Put right notice period	12 months
712 Fifth Avenue [Member]
Other Commitments [Line Items]
Equity method ownership percentage	50.00%
Predecessor [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Percentage of tenancy-in-common interest in property	50.00%
Predecessor [Member] \| 712 Fifth Avenue [Member]
Other Commitments [Line Items]
Equity method ownership percentage	50.00%
Owned by Affiliate [Member] \| Predecessor [Member] \| 718 Fifth Avenue [Member] \| Third Party Affiliate [Member]
Other Commitments [Line Items]
Equity method ownership percentage	25.00%
Owned by Affiliate [Member] \| Parent Company [Member] \| Put Right Exercised [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Pre IPO ownership percentage	25.00%
Owned by Affiliate [Member] \| Retail Type Space [Member] \| Predecessor [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Area of office properties	19,050

Ownership percentage for tenants in common interest in property.

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- Definition

Predecessor ownership percentage of property.

+ References

No definition available.

+ Details

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- Definition

Minimum duration of a put right notice required to be provided by the partner to exercise the put right.

+ References

No definition available.

+ Details

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

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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.

+ References

No definition available.

+ Details

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