Commitments and Contingencies - Additional Information (Details)	9 Months Ended
Sep. 30, 2015 ft²
Other Commitments [Line Items]
Prime retail space of building	10,400,000
718 Fifth Avenue [Member]
Other Commitments [Line Items]
Put right exercise period after sale of interest	4 years
Put right notice period	12 months
Put right actual purchase period	5 years
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] \| 718 Fifth Avenue [Member] \| Third Party Affiliate [Member]
Other Commitments [Line Items]
Equity method ownership percentage	25.00%
Predecessor [Member] \| 712 Fifth Avenue [Member]
Other Commitments [Line Items]
Equity method ownership percentage	50.00%
Parent Company [Member] \| Put Right Exercised [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Equity method ownership percentage	25.00%
Retail Type Space [Member] \| Predecessor [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Prime retail space of building	19,050

Ownership percentage for tenants in common interest in property.

No definition available.

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- Definition

Minimum duration in years from the time of the original sale that the purchase of the property could be made.

+ References

No definition available.

+ Details

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- Definition

Duration of time from the period of sale that the put right may be exercised by the partner.

+ 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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Period Type:	instant

- 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=6382943&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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