Related Party Transactions - Option Properties (Details) $ in Thousands	Jul. 15, 2014 USD ($)
Related Party Transaction [Line Items]
Business combination, consideration transferred	$ 733,600
111 West 33rd Street (formerly 112 West 34th Street) [Member]
Related Party Transaction [Line Items]
Business combination, consideration transferred	423,600
Business combination, consideration transferred, equity interests issued and issuable	229,000
Cash payments to acquire business	106,900
111 West 33rd Street (formerly 112 West 34th Street) [Member] \| Affiliated Entity [Member] \| Option Properties Transaction [Member]
Related Party Transaction [Line Items]
Business combination, consideration transferred	423,600
Cash payments to acquire business	92,400
111 West 33rd Street (formerly 112 West 34th Street) [Member] \| Anthony E. Malkin [Member] \| Option Properties Transaction [Member]
Related Party Transaction [Line Items]
Business combination, consideration transferred, equity interests issued and issuable	39,400
111 West 33rd Street (formerly 112 West 34th Street) [Member] \| Peter L. Malkin [Member] \| Option Properties Transaction [Member]
Related Party Transaction [Line Items]
Business combination, consideration transferred, equity interests issued and issuable	2,700
111 West 33rd Street (formerly 112 West 34th Street) [Member] \| Malkin Group [Member] \| Option Properties Transaction [Member]
Related Party Transaction [Line Items]
Business combination, consideration transferred, equity interests issued and issuable	44,900
Location 1400 Broadway [Member]
Related Party Transaction [Line Items]
Business combination, consideration transferred	310,000
Business combination, consideration transferred, equity interests issued and issuable	150,300
Cash payments to acquire business	79,700
Location 1400 Broadway [Member] \| Affiliated Entity [Member] \| Option Properties Transaction [Member]
Related Party Transaction [Line Items]
Business combination, consideration transferred	310,000
Cash payments to acquire business	56,600
Location 1400 Broadway [Member] \| Anthony E. Malkin [Member] \| Option Properties Transaction [Member]
Related Party Transaction [Line Items]
Business combination, consideration transferred, equity interests issued and issuable	23,300
Location 1400 Broadway [Member] \| Malkin Group [Member] \| Option Properties Transaction [Member]
Related Party Transaction [Line Items]
Business combination, consideration transferred, equity interests issued and issuable	$ 23,500

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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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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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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