Subsequent Events (Details) - Subsequent Event - 330 Madison Avenue - Office ft² in Thousands	1 Months Ended
Jul. 19, 2017 USD ($) ft²
Subsequent Events
Equity method ownership percentage	25.00%
Net proceeds after repayment of existing mortgage	$ 85,000,000
330 Madison Avenue Joint Venture
Subsequent Events
Square Footage Of Real Estate Property \| ft²	845
330 Madison Avenue Joint Venture \| Loans due August 2024
Subsequent Events
Loans Payable	$ 500,000,000
Debt Term	7 years
Debt, fixed rate	3.43%
Debt Instrument Maturity	2024-08
330 Madison Avenue Joint Venture \| Mortgages
Subsequent Events
Loans Payable	$ 150,000,000
Debt Instrument, Description of Variable Rate Basis	LIBOR
330 Madison Avenue Joint Venture \| Mortgages \| LIBOR
Subsequent Events
Spread Over LIBOR (in percentage)	1.30%

Area of a real estate property.

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- Definition

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

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- 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.

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- Definition

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

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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

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

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- Definition

The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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-Name Accounting Standards Codification
-Glossary Financing Activities
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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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No definition available.

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Debt Instrument Maturity Date in YYYY-MM format.

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