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Variable Interest Entities (Narrative) (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Variable Interest Entities [Abstract]
VIE liabilities, contingent liabilities, and guarantees	$ 0	$ 0

X

- Definition

Variable Interest Entity Disclosure [Abstract]

+ References

No definition available.

+ Details

Name:	cohn_VariableInterestEntityDisclosureAbstract
Namespace Prefix:	cohn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount of the liabilities in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5728-111685

+ Details

Name:	us-gaap_VariableInterestEntityNonconsolidatedCarryingAmountLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant