Long Term Debt, Fixed Rate Debt and Floating Rate Debt, Total

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

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.22)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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+ Details

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- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

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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

+ Details

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- 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

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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-Topic 835

-SubTopic 30

-Section 55

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-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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 FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-Name Accounting Standards Codification

-Topic 942

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

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-Topic 944

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-Section S99

-Paragraph 1

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

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

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- Definition

The cash outflow for cost incurred in the modification of term of existing debt agreement in order for the entity to achieve some advantage.

+ 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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 15

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

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Debt Schedule of Long term Debt (Details) (USD $)	0 Months Ended	12 Months Ended	0 Months Ended
Debt Schedule of Long term Debt (Details) (USD $)	Feb. 01, 2014	Dec. 31, 2014	Nov. 05, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total		903,985,000us-gaap_LongTermDebt		$ 883,112,000us-gaap_LongTermDebt
Mortgages [Member]
Debt Instrument [Line Items]
Fixed rate debt		746,916,000		824,088,000
Floating rate debt		135,146,000		47,331,000
Total mortgage debt		882,062,000		871,419,000
Total principal		1,602,062,000		1,196,419,000
Unamortized premiums, net of unamortized discount		9,590,000		11,693,000
Total		1,611,652,000		1,208,112,000
Mortgages [Member] \| 501 Seventh Avenue - Note 1 [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		1,037,000
Mortgages [Member] \| 501 Seventh Avenue - Note 2 - Tranche 1 [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		31,459,000
Mortgages [Member] \| 501 Seventh Avenue - Note 2 - Tranche 2 [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		6,889,000
Mortgages [Member] \| Fixed Rate Debt, 1359 Broadway [Member]
Debt Instrument [Line Items]
Floating rate debt		44,146,000		0
Mortgages [Member] \| Fixed Rate Debt, 1359 Broadway [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Interest rate at end of period		1.92%
Mortgages [Member] \| One Grand Central Place [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.35%
Interest rate at end of period		1.52%
Mortgages [Member] \| One Grand Central Place [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Floating rate debt		91,000,000		0
Mortgages [Member] \| 1359 Broadway - First Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		9,579,000
Mortgages [Member] \| 1359 Broadway - Second Lien - Tranche 1 [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		5,561,000
Mortgages [Member] \| 1359 Broadway - Second Lien - Tranche 2 [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		11,311,000
Mortgages [Member] \| 1359 Broadway - Second Lien - Tranche 3 [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		18,572,000
Mortgages [Member] \| One Grand Central Place - First Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		71,723,000
Mortgages [Member] \| One Grand Central Place - Second Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		14,884,000
Mortgages [Member] \| 500 Mamaroneck Avenue [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		32,620,000
Mortgages [Member] \| 250 West 57th Street - First Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		25,621,000
Mortgages [Member] \| 250 West 57th Street - Second Lien [Member]
Debt Instrument [Line Items]
Fixed rate debt		0		11,252,000
Mortgages [Member] \| Metro Center [Member]
Debt Instrument [Line Items]
Stated Rate		3.59%
Effective Rate		3.66%
Fixed rate debt		99,845,000		96,158,000
Payments for Fees			2,800,000
Mortgages [Member] \| 10 Union Square [Member]
Debt Instrument [Line Items]
Stated Rate		6.00%
Effective Rate		6.77%
Fixed rate debt		20,641,000		20,972,000
Mortgages [Member] \| 10 Bank Street [Member]
Debt Instrument [Line Items]
Stated Rate		5.72%
Effective Rate		6.21%
Fixed rate debt		32,847,000		33,444,000
Mortgages [Member] \| 1542 Third Avenue [Member]
Debt Instrument [Line Items]
Stated Rate		5.90%
Effective Rate		6.60%
Fixed rate debt		18,628,000		19,011,000
Mortgages [Member] \| First Stamford Place [Member]
Debt Instrument [Line Items]
Stated Rate		5.65%
Effective Rate		6.15%
Fixed rate debt		242,294,000		245,629,000
Mortgages [Member] \| 1010 Third Avenue and 77 West 55th Street [Member]
Debt Instrument [Line Items]
Stated Rate		5.69%
Effective Rate		6.20%
Fixed rate debt		27,595,000		28,096,000
Mortgages [Member] \| 383 Main Avenue [Member]
Debt Instrument [Line Items]
Stated Rate		5.59%
Effective Rate		6.09%
Fixed rate debt		29,852,000		30,403,000
Mortgages [Member] \| 1333 Broadway [Member]
Debt Instrument [Line Items]
Stated Rate		6.32%
Effective Rate		3.82%
Fixed rate debt		69,575,000		70,447,000
Mortgages [Member] \| 1350 Broadway - First Lien Mortgage Loan [Member]
Debt Instrument [Line Items]
Stated Rate		5.87%
Effective Rate		3.60%
Fixed rate debt		38,900,000		39,420,000
Mortgages [Member] \| 501 Seventh Avenue - Third Lien [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Floating rate debt		0		6,540,000
Mortgages [Member] \| 1350 Broadway - 2nd Lien Mortgage Loan [Member]
Debt Instrument [Line Items]
Floating rate debt		0		13,409,000
Mortgages [Member] \| One Grand Central Place - Third Lien [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Floating rate debt		0		6,382,000
Mortgages [Member] \| 250 West 57th Street - Third lien [Member] \| Interest Rate Fix Option 1 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		3.00%
Mortgages [Member] \| 250 West 57th Street - Third lien [Member] \| Interest Rate Fix Option 2 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		3.00%
Mortgages [Member] \| 250 West 57th Street - Third lien [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Floating rate debt		0		21,000,000
Mortgages [Member] \| Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Floating rate debt		170,000,000		25,000,000
Mortgages [Member] \| Secured Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.20%
Interest rate at end of period		1.37%
Mortgages [Member] \| Secured Term Credit Facility [Member]
Debt Instrument [Line Items]
Floating rate debt		300,000,000		300,000,000
Mortgages [Member] \| Secured Term Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.35%
Interest rate at end of period		1.52%
Mortgages [Member] \| 1400 Broadway - First Lien [Member]
Debt Instrument [Line Items]
Stated Rate		6.12%
Effective Rate		3.80%
Fixed rate debt		69,689,000		0
Mortgages [Member] \| 1400 Broadway - Second Lien [Member]
Debt Instrument [Line Items]
Stated Rate		3.35%
Effective Rate		1.00%
Fixed rate debt		9,803,000		0
Mortgages [Member] \| 112 West 34th Street - First Lien [Member]
Debt Instrument [Line Items]
Stated Rate		6.01%
Effective Rate		3.45%
Fixed rate debt		77,484,000		0
Mortgages [Member] \| 112 West 34th Street - Second Lien [Member]
Debt Instrument [Line Items]
Stated Rate		6.56%
Effective Rate		4.01%
Fixed rate debt		9,763,000		0
Mortgages [Member] \| Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Stated Rate		2.625%
Effective Rate		3.95%
Fixed rate debt		250,000,000		$ 0