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Variable Interest Entities (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Variable Interest Entity [Line Items] |
Assets in partnership | $ 199.6
Weisel Capital Management LLC [Member] |
Variable Interest Entity [Line Items] |
Assets in partnership | $ 286.0

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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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Period Type: | duration

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- Definition Carrying amount of the assets 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=77990344&loc=d3e5728-111685 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=sf_WeiselCapitalManagementLLCMember
Namespace Prefix: |
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Balance Type: |
Period Type: |