Mortgages and Other Loans Payable (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Mortgage note and other loan payable
Total fixed rate debt	$ 500,000,000	$ 620,000,000
Total floating rate debt	253,424,000	100,000,000
Total fixed and floating rate debt	753,424,000	720,000,000
Gross book value of the property and investment collateralizing the mortgage note and other loan payable	2,000,000,000	1,900,000,000
Master Repurchase Agreement
Mortgage note and other loan payable
Total floating rate debt	253,424,000	100,000,000
Maximum borrowing capacity	$ 300,000,000.0
Basis Point Fee (as a percent)	25.00%
Threshold amount for basis point fee to be applicable (less than)	$ 150,000,000.0
919 Third Avenue
Mortgage note and other loan payable
Total fixed rate debt	$ 500,000,000	500,000,000
Controlling interest in the joint venture (as a percent)	51.00%
711 Third Avenue
Mortgage note and other loan payable
Total fixed rate debt	$ 0	$ 120,000,000
Weighted Average \| Master Repurchase Agreement
Mortgage note and other loan payable
Interest Rate (as a percent)	3.36%
Weighted Average \| 919 Third Avenue
Mortgage note and other loan payable
Interest rate (as a percent)	5.12%
LIBOR \| Minimum \| Master Repurchase Agreement
Mortgage note and other loan payable
Interest rate (as a percent)	250.00%
LIBOR \| Maximum \| Master Repurchase Agreement
Mortgage note and other loan payable
Interest rate (as a percent)	325.00%

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Line of Credit Facility, Threshold Amount for Basis Point Fee

+ References

No definition available.

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- Definition

Represents the carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations and other loans payable.

+ References

No definition available.

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The portion of the carrying amount of long-term secured loans 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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The portion of the carrying amount of long-term secured loans 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.

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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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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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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

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- Definition

The interest rate applicable to 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

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

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

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

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- Definition

The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=55761124&loc=SL6224234-111729

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