Area of a real estate property.

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of gain on the sale of property that does not qualify for gain recognition as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 40
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.U.Q2)
-URI http://asc.fasb.org/extlink&oid=6955272&loc=d3e221323-122791

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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=6382943&loc=d3e33918-111571

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- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

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- Definition

The cash inflow from sale of buildings.

+ 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 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

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Balance Type:	debit
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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.

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- Definition

Debt Instrument Maturity Date (String)

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No definition available.

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Balance Type:	na
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- Definition

Duration over which the debt is amortized.

+ References

No definition available.

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- Definition

Duration for which the loan has a fixed interest rate.

+ References

No definition available.

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- Definition

Percentage of ownership sold, in equity method investments.

+ References

No definition available.

+ Details

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- Definition

This element represents gain loss on sale of assets from continuing operations.

+ References

No definition available.

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- Definition

The term of the extension available, in years

+ References

No definition available.

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Data Type:	xbrli:durationItemType
Balance Type:	na
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- Definition

The total number of term extensions available to the borrower

+ References

No definition available.

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- Definition

Property Plant And Equipment Financing Transaction Price Per Square Feet

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No definition available.

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- Definition

The value of property on which a sale transaction is based on.

+ References

No definition available.

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Investments in Partially Owned Entities (Warner Building,280 Park Avenue,7West 34th Street,West93rdStreet) (Details) ft² in Thousands, $ in Thousands						3 Months Ended			9 Months Ended
	Aug. 03, 2016 USD ($) Extensions	May 27, 2016 USD ($) $ / ft²	May 16, 2016 USD ($) ft²	May 11, 2016 USD ($) ft² Extensions	May 06, 2016 USD ($) ft²	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable						$ 9,867,550			$ 9,867,550		$ 9,513,713
Net gains on sale of real estate and a lease position									5,074	$ 65,396
Gain on sale, recognized						$ 0		$ 103,037	$ 160,225	$ 104,897
The Warner Building \| Joint Venture
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage					55.00%
Square Footage Of Real Estate Property \| ft²					621
The Warner Building \| Joint Venture \| Mortgage Loan at 3.65% matures June 2023
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable					$ 273,000
Interest Rate, End of Period (in percentage)					3.65%
Debt Instrument Maturity					Jun 2023
Fixed interest rate, duration					2 years
Debt amortization, duration					30 years
The Warner Building \| Joint Venture \| Mortgage Loan at 6.26% matures May 2016
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable					$ 293,000
Interest Rate, End of Period (in percentage)					6.26%
Debt Instrument Maturity					May 2016
280 Park Avenue \| Joint Venture
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage				50.00%
Square Footage Of Real Estate Property \| ft²				1,250
280 Park Avenue \| Joint Venture \| Mortgage Loan at 2.51% matures 2019
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable				$ 900,000
Interest Rate, End of Period (in percentage)						2.51%			2.51%
Spread Over LIBOR (in percentage)				2.00%
Number Of Extensions Available \| Extensions				4
Length Of Extension Available				1 year
Term of loan				3 years
280 Park Avenue \| Joint Venture \| Mortgage Loan at 6.35% matures June 2016
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable				$ 721,000
Interest Rate, End of Period (in percentage)				6.35%
Debt Instrument Maturity				Jun 2016
7 West 34th Street
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage						53.00%			53.00%
Deferred gain						$ 43,813			$ 43,813
7 West 34th Street \| Joint Venture
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage		53.00%
Square Footage Of Real Estate Property \| ft²			477
Ownership sold, percentage		47.00%
Value of property		$ 561,000
Value of property, per square foot \| $ / ft²		1,176
Net proceeds from sale		$ 127,382
Net gains on sale of real estate and a lease position		203,324
Gain on sale, recognized							$ 159,511
Deferred gain		43,813
Net gain, Total		$ 90,017
7 West 34th Street \| Joint Venture \| Mortgage Loan at 3.65% matures June 2026
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable			$ 300,000
Interest Rate, End of Period (in percentage)			3.65%
Term of loan			10 years
Debt Instrument Maturity			June 2026
50-70 West 93rd Street \| Joint Venture
Schedule Of Equity Method Investments [Line Items]
Equity method ownership percentage	49.90%
Number Of Extensions Available \| Extensions	2
50-70 West 93rd Street \| Joint Venture \| Previous First Mortgage
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable	$ 44,980
Spread Over LIBOR (in percentage)	1.90%
50-70 West 93rd Street \| Joint Venture \| Previous Second Mortgage matures in September 2016
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable	$ 18,481
Spread Over LIBOR (in percentage)	1.65%
Debt Instrument Maturity	September 2016
50-70 West 93rd Street \| Joint Venture \| Mortgage Loan at 2.22%
Schedule Of Equity Method Investments [Line Items]
Notes And Loans Payable	$ 80,000
Interest Rate, End of Period (in percentage)						2.22%			2.22%
Spread Over LIBOR (in percentage)	1.70%
Length Of Extension Available	1 year
Term of loan	3 years