Debt instrument, maturity date in month and year.

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Reflects the revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations. Additionally, reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

+ References

No definition available.

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Lease and rental income from unconsolidated joint venture .

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No definition available.

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- Definition

Ownership interest percentage in property.

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No definition available.

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- Definition

Ownership percentage in property funds.

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No definition available.

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- Definition

Percentage of ownership interest held by management.

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No definition available.

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- Definition

Percentage of ownership interest in new joint venture.

+ References

No definition available.

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- Definition

Related party markup cost percentage.

+ References

No definition available.

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- Definition

Transaction related costs.

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No definition available.

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- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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- Definition

Area of a real estate property.

+ References

No definition available.

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- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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Amount of interest expense incurred on a debt or other obligation to related party.

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No definition available.

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- Definition

Base revenue, as contractually stipulated, for operating and managing another entity's business during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The amount for notes payable (written promise to pay), due to related parties.

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

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No definition available.

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Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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No definition available.

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Related Parties - Additional Information (Details)			12 Months Ended
Related Parties - Additional Information (Details)	Nov. 01, 2017	Jul. 17, 2017	Dec. 31, 2017 USD ($) ft²	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jul. 16, 2017 ft²	Jun. 30, 2017	Jan. 24, 2017	Dec. 05, 2016 ft²	Dec. 04, 2016 ft²
Related Party Transaction [Line Items]
Due to affiliates			$ 27,299,000	$ 27,299,000
Interest Expense, Related Party			197,000	139,000	$ 136,000
Fee and other income			37,666,000	48,237,000	24,993,000
Accounts and other receivables, net			17,082,000	15,251,000
Transaction related costs			2,027,000	2,404,000	10,355,000
Accounts payable and accrued expenses			$ 117,630,000	103,896,000
Area of related party lease \| ft²			12,500,000
50 Beale Street [Member]
Related Party Transaction [Line Items]
Maturity Date		2021-10
Percentage of ownership interest in new joint venture		36.60%
50 Beale Street [Member] \| Fund VII and Fund VII H [Member]
Related Party Transaction [Line Items]
Area of related party lease \| ft²						660,625
Property ownership, percentage		42.80%				42.80%
Percentage of ownership interest in new joint venture		36.60%
712 Fifth Avenue [Member]
Related Party Transaction [Line Items]
Equity method ownership percentage			50.00%
Property ownership, percentage							50.00%
60 Wall Street [Member]
Related Party Transaction [Line Items]
Equity method ownership percentage			5.00%					5.00%
60 Wall Street [Member] \| Fund II and III [Member]
Related Party Transaction [Line Items]
Property funds, percentage								62.30%
Management Agreements [Member]
Related Party Transaction [Line Items]
Fee and other income			$ 824,000	795,000	776,000
Amounts owed under management agreements			0
CNBB-RDF Holdings, LP [Member]
Related Party Transaction [Line Items]
Due to affiliates			24,500,000
CNBB-RDF Holdings Otto Family [Member]
Related Party Transaction [Line Items]
Due to affiliates			2,799,000
Unconsolidated Joint Ventures and Real Estate Funds [Member]
Related Party Transaction [Line Items]
Property management, asset management, leasing and other related services fee income			20,263,000	$ 9,920,000	2,308,000
Accounts and other receivables, net			1,627,000
Hamburg Trust Consulting GMBH ("HTC") [Member]
Related Party Transaction [Line Items]
Mark-up cost percentage				10.00%
Transaction related costs			247,000	$ 625,000	$ 349,000
Accounts payable and accrued expenses			$ 51,000
Hamburg Trust Consulting GMBH ("HTC") [Member] \| Chairman, Chief Executive Officer and President [Member]
Related Party Transaction [Line Items]
Percentage of ownership				100.00%
Mannheim Trust [Member] \| Board of Director [Member] \| 712 Fifth Avenue [Member]
Related Party Transaction [Line Items]
Area of related party lease \| ft²									5,593	6,790
Equity method ownership percentage			50.00%
Lease rental income			$ 358,000	$ 416,000
Notes Payable to Related Parties [Member] \| CNBB-RDF Holdings, LP [Member]
Related Party Transaction [Line Items]
Maturity Date	2018-11			2017-10
Note payable, fixed bearing interest rate	1.40%			0.50%
Notes Payable to Related Parties [Member] \| CNBB-RDF Holdings Otto Family [Member]
Related Party Transaction [Line Items]
Maturity Date	2018-11			2017-10
Note payable, fixed bearing interest rate	1.40%			0.50%