Debt instrument, maturity date in month and year.

No definition available.

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- Definition

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.

+ Details

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- Definition

Lease and rental income from unconsolidated joint venture .

+ References

No definition available.

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- Definition

Percentage of ownership interest held by management.

+ 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.

+ References

No definition available.

+ Details

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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
-Subparagraph (SX 210.9-03.15(1),(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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.

+ 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(3))
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.17)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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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.

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- Definition

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

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Related Party - Additional Information (Details)		3 Months Ended		6 Months Ended
Related Party - Additional Information (Details)	Nov. 01, 2017	Jun. 30, 2018 USD ($) ft²	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) ft²	Jun. 30, 2017 USD ($)	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		97,000	$ 35,000	192,000	$ 69,000
Fee and other income		8,726,000	7,661,000	15,346,000	20,655,000
Accounts and other receivables, net		15,549,000		15,549,000		17,082,000
Transaction related costs		293,000	502,000	413,000	777,000
Accounts payable and accrued expenses		$ 123,720,000		$ 123,720,000		117,630,000
Area of related party lease \| ft²		12,500,000		12,500,000
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		$ 215,000	210,000	$ 424,000	412,000
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		4,558,000	3,369,000	7,094,000	11,775,000
Accounts and other receivables, net		$ 1,722,000		$ 1,722,000		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		$ 42,000	134,000	$ 60,000	170,000
Accounts payable and accrued expenses		$ 83,000		$ 83,000		$ 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		$ 89,000	$ 84,000	$ 181,000	$ 178,000
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%