Name:	crbn_ManagementFeePercentage
Namespace Prefix:	crbn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The amount of management fees paid annually, calculated as a percentage of committed and/or invested capital.

No definition available.

Name:	crbn_ManagementFeesPaidAnnually
Namespace Prefix:	crbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The percentage of carried interest available to the Managing Partner after return of all capital contributed by the investors and payment of preferred return to the investors.

No definition available.

Name:	crbn_ManagingPartnerCarriedInterestPercentage
Namespace Prefix:	crbn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The preferred return payable to the investors following return of invested capital.

No definition available.

Name:	crbn_PreferredReturnOnInvestmentPercentage
Namespace Prefix:	crbn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

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=6382943&loc=d3e33918-111571

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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 210.5-02.12)

-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 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570

Name:	us-gaap_EquityMethodInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Cost of the investment.

No definition available.