Area of a real estate property.

No definition available.

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

+ Details

Name:	us-gaap_DebtInstrumentConvertibleRemainingDiscountAmortizationPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: 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))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of write-off of deferred financing costs and debt discounts related to prepetition debt obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 55

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=34712771&loc=d3e56145-112766

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 852

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=6916575&loc=d3e55730-112764

+ Details

Name:	us-gaap_DebtorReorganizationItemsWriteOffOfDeferredFinancingCostsAndDebtDiscounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateFaceAmountOfMortgages
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

Reference 3: 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

+ Details

Name:	us-gaap_NotesAndLoansPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, the carrying value of notes payable which were initially due after one year or beyond the normal operating cycle, if longer, and which are not otherwise defined in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: 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(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

+ Details

Name:	us-gaap_OtherNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from a debt initially having maturity 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

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfUnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the total cash outflow that relates to a commitment made by the company or its subsidiaries.

+ References

No definition available.

+ Details

Name:	vrlp_CommitmentFundedDuringPeriod
Namespace Prefix:	vrlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which the debt was issued by the issuer.

+ References

No definition available.

+ Details

Name:	vrlp_DebtInstrumentIssuancePricePercentage
Namespace Prefix:	vrlp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the new debt was scheduled to mature in string format.

+ References

No definition available.

+ Details

Name:	vrlp_DebtInstrumentMaturityDateNew
Namespace Prefix:	vrlp_
Data Type:	invest:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the original debt was scheduled to mature in string format.

+ References

No definition available.

+ Details

Name:	vrlp_DebtInstrumentMaturityDateOriginal
Namespace Prefix:	vrlp_
Data Type:	invest:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Maturity Date (String)

+ References

No definition available.

+ Details

Name:	vrlp_DebtInstrumentMaturityDateString
Namespace Prefix:	vrlp_
Data Type:	invest:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents debt maturity beginning period of loan.

+ References

No definition available.

+ Details

Name:	vrlp_DebtMaturityBeginningPeriod
Namespace Prefix:	vrlp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Extension Executed On Number Of Revolving Credit Facility

+ References

No definition available.

+ Details

Name:	vrlp_ExtensionExecutedOnNumberOfRevolvingCreditFacility
Namespace Prefix:	vrlp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The term of the extension available, in years

+ References

No definition available.

+ Details

Name:	vrlp_LengthOfExtensionAvailable
Namespace Prefix:	vrlp_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of debt refinanced

+ References

No definition available.

+ Details

Name:	vrlp_NotesAndLoansPayableRefinancedAmount
Namespace Prefix:	vrlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total number of term extensions available to the borrower

+ References

No definition available.

+ Details

Name:	vrlp_NumberOfExtensionsAvailable
Namespace Prefix:	vrlp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Loan Tranches

+ References

No definition available.

+ Details

Name:	vrlp_NumberOfLoanTranches
Namespace Prefix:	vrlp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Office Buildings

+ References

No definition available.

+ Details

Name:	vrlp_NumberOfOfficeBuildings
Namespace Prefix:	vrlp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number Of Revolving Credit Facility

+ References

No definition available.

+ Details

Name:	vrlp_NumberOfRevolvingCreditFacility
Namespace Prefix:	vrlp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the unfunded portion of the commitments to the Real Estate Fund

+ References

No definition available.

+ Details

Name:	vrlp_UnfundedCommitmentsToRealEstateFund
Namespace Prefix:	vrlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=vrlp_SeniorUnsecuredNotesDue2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_NotesAndMortgagesPayableFixedRateJuniorPositionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_NotesAndMortgagesPayableFixedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_NotesAndMortgagesPayableFixedRateSeniorPositionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_NotesAndMortgagesPayableVariableRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_SeniorUnsecuredNotesFourPointsTwoFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_SeniorUnsecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_SeniorUnsecuredNotesSevenPointsEightSevenFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_StandbyCommitmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_TotalNotesAndMortgagesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=vrlp_UnsecuredRevolvingCreditFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=vrlp_NewYorkManhattan220CentralParkSouthSiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=vrlp_NewYorkOfficeTwoPennPlazaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Narratives) (Details) (USD $)	12 Months Ended			0 Months Ended										1 Months Ended	3 Months Ended	1 Months Ended	0 Months Ended
Debt (Narratives) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 16, 2014	Jan. 31, 2014	Apr. 16, 2014 sqft	Jul. 16, 2014 sqft	Dec. 08, 2014	Jan. 06, 2015 Tranches	Jan. 15, 2015	Aug. 12, 2014 Properties Extensions sqft	Oct. 27, 2014 Extensions sqft	Aug. 26, 2014	Oct. 31, 2014	Dec. 31, 2014	Jan. 31, 2015	Sep. 30, 2014 Extensions CreditFacilities
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)	$ 8,263,165,000us-gaap_NotesAndLoansPayable	$ 7,131,231,000us-gaap_NotesAndLoansPayable													$ 8,263,165,000us-gaap_NotesAndLoansPayable
Proceeds from borrowings	2,428,285,000	2,262,245,000	3,593,000,000
Senior Unsecured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity				June 30, 2019
Interest Rate, End of Period (in percentage)				2.581%
Public Offering Of Notes Payable (in US Dollars)				450,000,000
Public Offering, Interest Rate				2.50%
Debt Instrument Issuance Price Percentage				99.619%
New York Manhattan 220 Central Park South Site [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis					LIBOR
New York Two Penn Plaza [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)								153,000,000
Notes And Mortgages Payable Fixed Rate [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)	6,499,396,000	6,439,371,000													6,499,396,000
Interest Rate, End of Period (in percentage)	4.46%														4.46%
Notes And Mortgages Payable Fixed Rate [Member] \| New York 909 Third Avenue [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)						193,000,000
Debt Instrument Maturity						May 2021
Notes And Loans Payable Refinanced Amount (in US Dollars)						350,000,000
Square Footage Of Real Estate Property						1,300,000
Debt Term						7 years
Interest Rate, End of Period (in percentage)		5.64%				3.91%
Proceeds from borrowings						145,000,000
Notes And Mortgages Payable Fixed Rate [Member] \| Las Catalinas Mall [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)							130,000,000
Debt Instrument Maturity							August 2024
Square Footage Of Real Estate Property							494,000
Debt Term							10 years
Interest Rate, End of Period (in percentage)							4.43%
Debt Instrument Amortization Period							30 years
Debt Maturity Beginning Period							6 years
Notes And Mortgages Payable Fixed Rate [Member] \| New York Two Penn Plaza [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)								422,000,000
Debt Instrument Maturity								March 2018
Interest Rate, End of Period (in percentage)								4.78%
Notes And Mortgages Payable Fixed Rate [Member] \| New York Two Penn Plaza [Member] \| Swap [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity								March 2018
Interest Rate, End of Period (in percentage)								4.78%
Notes And Mortgages Payable Fixed Rate [Member] \| Retail Montehiedra Town Center [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)									120,000,000
Interest Rate, End of Period (in percentage)									6.04%
Number Of Loan Tranches									2
Debt Instrument Maturity Date Original									July 2016
Debt Instrument Maturity Date New									July 2021
Notes And Mortgages Payable Fixed Rate [Member] \| Retail Montehiedra Town Center [Member] \| Subsequent Event [Member] \| Urban Edge Properties [Member]
Debt Instrument [Line Items]
Interest Rate, End of Period (in percentage)										10.00%
Unfunded Commitments to the Real Estate Fund										20,000,000
Commitment Funded During Period										8,000,000
Notes And Mortgages Payable Fixed Rate Senior Position [Member] \| Retail Montehiedra Town Center [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Interest Rate, End of Period (in percentage)									5.33%
Principal amount of mortgage loans									90,000,000
Notes And Mortgages Payable Fixed Rate Junior Position [Member] \| Retail Montehiedra Town Center [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Interest Rate, End of Period (in percentage)									3.00%
Principal amount of mortgage loans									30,000,000
Notes And Mortgages Payable Variable Rate [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)	1,763,769,000	691,860,000													1,763,769,000
Interest Rate, End of Period (in percentage)	2.20%														2.20%
Notes And Mortgages Payable Variable Rate [Member] \| New York Manhattan 220 Central Park South Site [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)					600,000,000
Spread Over LIBOR (in percentage)					2.75%
Debt Instrument Maturity					January 2016
Number Of Extensions Available					3
Length Of Extension Available					1 year
Interest Rate, End of Period (in percentage)	2.92%														2.92%
Notes And Mortgages Payable Variable Rate [Member] \| Washington DC Universal Buildings [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)											185,000,000
Debt Instrument, Description of Variable Rate Basis											LIBOR
Spread Over LIBOR (in percentage)											1.90%
Debt Instrument Maturity											August 2019
Number Of Extensions Available											2
Length Of Extension Available											1 year
Square Footage Of Real Estate Property											690,000
Interest Rate, End of Period (in percentage)	2.06%														2.06%
Debt Instrument Amortization Period											30 years
Debt Maturity Beginning Period											4 years
Number Of Office Buildings											2
Notes And Mortgages Payable Variable Rate [Member] \| New York 655 Fifth Avenue [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)												140,000,000
Debt Instrument, Description of Variable Rate Basis												LIBOR
Spread Over LIBOR (in percentage)												1.40%
Debt Instrument Maturity												October 2019
Number Of Extensions Available												2
Length Of Extension Available												1 year
Square Footage Of Real Estate Property												57,500
Interest Rate, End of Period (in percentage)	1.56%														1.56%
Notes And Mortgages Payable Variable Rate [Member] \| New York Two Penn Plaza [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis								LIBOR
Spread Over LIBOR (in percentage)								1.65%
Debt Instrument Maturity								2019
Number Of Extensions Available								2
Length Of Extension Available								1 year
Notes And Loans Payable Refinanced Amount (in US Dollars)								575,000,000
Square Footage Of Real Estate Property								1,600,000
Interest Rate, End of Period (in percentage)	1.81%														1.81%
Proceeds from borrowings								143,000,000
Notes And Mortgages Payable Variable Rate [Member] \| New York Two Penn Plaza [Member] \| Swap [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)								422,000,000
Total Notes And Mortgages Payable [Member]
Debt Instrument [Line Items]
Mortgages payable (in US Dollars)	8,263,165,000	7,131,231,000													8,263,165,000
Interest Rate, End of Period (in percentage)	3.98%														3.98%
Standby Commitment [Member] \| New York Manhattan 220 Central Park South Site [Member]
Debt Instrument [Line Items]
Debt Term													5 years
Mezzanine loan financing (in US Dollars)													500,000,000
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Interest Rate, End of Period (in percentage)	3.89%														3.89%
Senior Unsecured Notes 7.875% [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity														October 1, 2039
Interest Rate, End of Period (in percentage)														7.875%
Redemption of senior unsecured notes														445,000,000
Redemption Price, Percentage of Principal Amount Redeemed														100.00%
Unamortized deferred financing costs, write off															12,532,000
Senior Unsecured Notes 4.25% [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument Maturity																April 1, 2015
Interest Rate, End of Period (in percentage)																4.25%
Redemption of senior unsecured notes																500,000,000
Redemption Price, Percentage of Principal Amount Redeemed																100.00%
Unsecured Revolving Credit Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis																	LIBOR
Spread Over LIBOR (in percentage)	1.05%	1.25%
Number Of Extensions Available																	2
Length Of Extension Available																	6 months
Interest Rate, End of Period (in percentage)
Number Of Revolving Credit Facilities																	2
Extension Executed On Number Of Revolving Credit Facility																	1
Line of Credit Facility, Maximum Borrowing Capacity																	$ 1,250,000,000
Debt Instrument Maturity Date Original																	November 2015
Debt Instrument Maturity Date New																	November 2018
Facility Fee (in percentage)	0.20%	0.25%