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

- Definition

Lease and rental income.

+ References

No definition available.

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

- Definition

Percentage of ownership interest held by management.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Related party markup cost percentage.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

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

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(9))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Balance Type:	debit
Period Type:	instant

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460

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

- 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

+ Details

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Data Type:	num:percentItemType
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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Namespace Prefix:	us-gaap_
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

+ Details

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

- 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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-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.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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Related Party - Additional Information (Details)	3 Months Ended		9 Months Ended
Related Party - Additional Information (Details)	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items]
Due to affiliates	$ 27,299,000		$ 27,299,000		$ 27,299,000
Interest Expense, Related Party	43,000	$ 32,000	112,000	$ 101,000
Fee and other income	10,321,000	6,851,000	37,986,000	16,294,000
Accounts and other receivables	12,185,000		12,185,000		$ 10,844,000
Acquisition and transaction related costs	$ 282,000	485,000	$ 1,725,000	9,832,000
Area of office properties \| ft²	10,400,000		10,400,000
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	$ 195,000	$ 314,000	$ 594,000	$ 562,000
Accounts and other receivables	80,000		80,000
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]
Related Party Transaction [Line Items]
Accounts and other receivables	1,499,000		1,499,000
Property management, asset management, leasing and other related services fee income	$ 3,227,000		$ 7,826,000
Hamburg Trust Consulting GMBH (“HTC”) [Member]
Related Party Transaction [Line Items]
Mark-up cost percentage	10.00%		10.00%
Acquisition and transaction related costs	$ 137,000		$ 694,000
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]
Related Party Transaction [Line Items]
Lease rental income	$ 101,000		$ 305,000
Mannheim Trust [Member] \| Board of Director [Member] \| 712 Fifth Avenue [Member]
Related Party Transaction [Line Items]
Area of office properties \| ft²	6,790		6,790
Equity method ownership percentage	50.00%		50.00%
Notes Payable to Related Parties [Member] \| CNBB-RDF Holdings, LP [Member]
Related Party Transaction [Line Items]
Maturity Date			2017-10
Note payable, fixed bearing interest rate			0.50%
Notes Payable to Related Parties [Member] \| CNBB-RDF Holdings Otto Family [Member]
Related Party Transaction [Line Items]
Maturity Date			2017-10
Note payable, fixed bearing interest rate			0.50%