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

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- 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

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- 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