Acquisitions - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
Jul. 15, 2014	Jul. 15, 2014
112 West 34th Street [Member]
Business Acquisition [Line Items]
Total consideration paid	$ 423.6
Debt assumed	87.7
Payments to acquire businesses, gross	106.9
Consideration transferred, equity issued	229.0
Business acquisition, share price	$ 16.65	$ 16.65
112 West 34th Street [Member] \| Common Class A [Member]
Business Acquisition [Line Items]
Equity issued, number of shares	1,217,685
112 West 34th Street [Member] \| Common Class B [Member]
Business Acquisition [Line Items]
Equity issued, number of shares	77,945
112 West 34th Street [Member] \| Series PR OP Units [Member]
Business Acquisition [Line Items]
Equity issued, number of shares	12,457,379
1400 Broadway [Member]
Business Acquisition [Line Items]
Total consideration paid	310.0
Debt assumed	80.0
Payments to acquire businesses, gross	79.7
Consideration transferred, equity issued	$ 150.3
Business acquisition, share price	$ 16.65	$ 16.65
1400 Broadway [Member] \| Common Class A [Member]
Business Acquisition [Line Items]
Equity issued, number of shares	1,338,488
1400 Broadway [Member] \| Common Class B [Member]
Business Acquisition [Line Items]
Equity issued, number of shares	32,452
1400 Broadway [Member] \| Series PR OP Units [Member]
Business Acquisition [Line Items]
Equity issued, number of shares	7,658,516

Number of shares of equity interests issued or issuable to acquire entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

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- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

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- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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