Debt - Summary of Outstanding Debt (Parenthetical) (Details) - USD ($)	9 Months Ended
Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Letter of credit	$ 200,000,000
Revolving credit facility	50,000,000	$ 20,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving Credit Facility	1,000,000,000
1633 Broadway [Member] \| Two Hundred And Fifty Million Line Of Credit [Member]
Debt Instrument [Line Items]
Additional Borrowing Capacity Subject To Performance Hurdles	$ 250,000,000
Additional Borrowing Capacity Interest Rate Description	LIBOR plus 175 basis points
1633 Broadway [Member] \| Two Hundred And Fifty Million Line Of Credit [Member] \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	1.75%
900 Third Avenue [Member] \| Ten Million Line Of Credit [Member]
Debt Instrument [Line Items]
Revolving credit facility	$ 7,710,000
Line of Credit Borrowing Capacity	$ 10,000,000
Line Of Credit Facility Interest Rate Description	LIBOR plus 150 basis points and an additional liquidity premium of 66 basis points
900 Third Avenue [Member] \| Ten Million Line Of Credit [Member] \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	1.50%
Additional liquidity premium on variable rate	0.66%
One Market Plaza [Member]
Debt Instrument [Line Items]
Ownership interest rate of property	49.00%
One Market Plaza [Member] \| Twenty Million Line Of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Borrowing Capacity	$ 20,136,000
Line Of Credit Facility Interest Rate Description	LIBOR plus 300 basis points and an additional liquidity premium of 120 basis points
One Market Plaza [Member] \| Twenty Million Line Of Credit [Member] \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	3.00%
Additional liquidity premium on variable rate	1.20%

Additional borrowing capacity interest rate description.

No definition available.

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- Definition

The maximum amount that can be borrowed under the additional borrowing capacity subject to meeting the performance hurdles.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Liquidity premium spread on variable rate.

+ References

No definition available.

+ Details

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- Definition

Ownership percentage of property.

+ References

No definition available.

+ Details

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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.

+ Details

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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.

+ Details

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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

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

Reference 3: 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

+ Details

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Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

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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

+ Details

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