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Noncontrolling Interests (Property Partnerships) (Narrative) (Details) (USD $)
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9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 0 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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May 31, 2013
767 Fifth Avenue (The GM Building) [Member]
Consolidated Properties [Member]
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Apr. 10, 2014
Salesforece Tower (formerly Transbay Tower) [Member]
Consolidated Properties [Member]
sqft
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Sep. 30, 2013
Noncontrolling Interests [Member]
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May 31, 2013
Noncontrolling Interests [Member]
Consolidated Properties [Member]
partners
|
Oct. 09, 2013
Noncontrolling Interests [Member]
Time Square Tower [Member]
Consolidated Properties [Member]
sqft
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Feb. 26, 2013
Noncontrolling Interests [Member]
Salesforece Tower (formerly Transbay Tower) [Member]
Consolidated Properties [Member]
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Feb. 07, 2014
Noncontrolling Interests [Member]
Salesforece Tower (formerly Transbay Tower) [Member]
Consolidated Properties [Member]
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| Noncontrolling Interest [Line Items] | ||||||||||
| Property partnerships | $ 716,565,000 | $ 726,132,000 | ||||||||
| Partners Joint Venture Ownership Percentage | 40.00% | |||||||||
| Ownership Percentage | 45.00% | 5.00% | 50.00% | |||||||
| Sales price | 684,000,000 | |||||||||
| Ownership Percentage by Parent | 95.00% | 95.00% | ||||||||
| Number of Joint Venture Partners | 2 | |||||||||
| Noncontrolling interests recorded upon consolidation | 0 | 480,861,000 | 480,900,000 | 480,861,000 | ||||||
| maximum percentage of construction costs to allow partner to have a loan | 50.00% | |||||||||
| Portion of total costs partner can require the company to fund | 2.50% | |||||||||
| portion of partners equity that can be funded by the company | 50.00% | |||||||||
| Proceeds from sale of an interest in a real estate asset | 673,100,000 | |||||||||
| Area of Real Estate Property | 1,400,000 | 1,246,000 | ||||||||
| Portion allocation to noncontrolling interest based on carrying value of the total equity of the property prior to the sale | $ 243,500,000 | |||||||||