XML 118 R107.htm IDEA: XBRL DOCUMENT
v3.20.2

Segment Reporting (Schedule Of Operating Information, Segment) (Parenthetical) (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting [Abstract] |  |  |  |
Net revenues accounted for by individual client, maximum percentage | 10.00% | 10.00% | 10.00% | 10.00%

X
- Definition Net revenues accounted for by individual client, maximum percentage. + References No definition available. + Details
Name: | sf_NetRevenuesAccountedForByIndividualClientMaximumPercentage
Namespace Prefix: | sf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration