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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Percentage of ownership interest held by management.

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- Definition

Related party markup cost percentage.

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- Definition

Transaction related costs.

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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.

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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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Area of a real estate property.

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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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Amount of interest expense incurred on a debt or other obligation to related party.

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

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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.

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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Related Parties - Additional Information (Details)		3 Months Ended		9 Months Ended
Related Parties - Additional Information (Details)	Nov. 01, 2017	Sep. 30, 2018 USD ($) ft²	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) ft²	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Due to affiliates		$ 27,299,000		$ 27,299,000		$ 27,299,000
Interest Expense, Related Party		98,000	$ 34,000	290,000	$ 103,000
Fee and other income		9,083,000	9,333,000	24,429,000	29,988,000
Property management, asset management, leasing and other related services fee income		4,079,000	5,834,000	12,953,000	19,838,000
Accounts and other receivables, net		16,205,000		16,205,000		17,082,000
Transaction related costs		450,000	274,000	863,000	1,051,000
Accounts payable and accrued expenses		$ 133,995,000		$ 133,995,000		117,630,000
Area of related party lease \| ft²		11,900,000		11,900,000
712 Fifth Avenue [Member]
Related Party Transaction [Line Items]
Equity method ownership percentage		50.00%		50.00%
Management Agreements [Member]
Related Party Transaction [Line Items]
Fee and other income		$ 200,000	207,000	$ 624,000	619,000
CNBB-RDF Holdings, LP [Member]
Related Party Transaction [Line Items]
Due to affiliates		24,500,000		24,500,000
CNBB-RDF Holdings Otto Family [Member]
Related Party Transaction [Line Items]
Due to affiliates		2,799,000		2,799,000
Unconsolidated Joint Ventures and Real Estate Funds [Member] \| Management Agreements [Member]
Related Party Transaction [Line Items]
Property management, asset management, leasing and other related services fee income		3,235,000	4,616,000	10,329,000	16,391,000
Accounts and other receivables, net		$ 1,700,000		$ 1,700,000		1,627,000
Hamburg Trust Consulting GMBH ("HTC") [Member]
Related Party Transaction [Line Items]
Mark-up cost percentage		10.00%		10.00%
Transaction related costs		$ 69,000	50,000	$ 129,000	220,000
Accounts payable and accrued expenses		$ 29,000		$ 29,000		$ 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%		100.00%
Mannheim Trust [Member] \| Board of Director [Member] \| 712 Fifth Avenue [Member]
Related Party Transaction [Line Items]
Equity method ownership percentage		50.00%		50.00%
Area of related party lease \| ft²		5,593		5,593
Lease rental income		$ 92,000	$ 96,000	$ 273,000	$ 274,000
Notes Payable To Related Parties \| CNBB-RDF Holdings, LP [Member]
Related Party Transaction [Line Items]
Maturity Date	2018-11
Note payable, fixed bearing interest rate	1.40%
Notes Payable To Related Parties \| CNBB-RDF Holdings Otto Family [Member]
Related Party Transaction [Line Items]
Maturity Date	2018-11
Note payable, fixed bearing interest rate	1.40%