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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 03, 2017 | May 03, 2016 | Jan. 04, 2016 | Jun. 05, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 04, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 968,834 | $ 962,282 |
Restricted stock units, charges at the date of modification |  |  |  |  | 55,900 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Restricted stock units, charges at the date of modification |  |  |  |  |  | 58,600 |
City Securities Corporation [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 7,100 |  |  |  |  |  |
Identifiable intangible assets | $ 4,100 |  |  |  |  |  |
Period of contingent consideration | 2 years |  |  |  |  |  |
Liability for earn-out payments |  |  |  |  | 500 |  |
ISM Capital LLP [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 6,300 |  |  |  |  |
Identifiable intangible assets |  | $ 2,300 |  |  |  |  |
Period of contingent consideration |  | 3 years |  |  |  |  |
Liability for earn-out payments |  |  |  |  | 1,900 | 3,700 |
Eaton Partners [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 72,000 |  |  |  |
Identifiable intangible assets |  |  | $ 32,300 |  |  |  |
Period of contingent consideration |  |  | 4 years |  |  |  |
Liability for earn-out payments |  |  |  |  | $ 31,200 | $ 27,300 |
Barclays Wealth and Investment Management, Americas [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 24,800
Deferred consideration, recognized as a liability |  |  |  |  |  |  | 15,200
Barclays Wealth and Investment Management, Americas [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  | 7,300
Barclays Wealth and Investment Management, Americas [Member] | Stifel Bank [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loans acquired in acquisition |  |  |  |  |  |  | $ 600,000
Sterne Agee Group, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill and intangible assets |  |  |  | $ 60,800 |  |  |
Fair value of awards issued as retention |  |  |  | 23,800 |  |  |
Employee retention compensation paid in notes |  |  |  | $ 33,800 |  |  |
Sterne Agee Group, Inc. [Member] | Minimum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Individual compensation and benefits useful period |  |  |  | 5 years |  |  |
Sterne Agee Group, Inc. [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Individual compensation and benefits useful period |  |  |  | 10 years |  |  |
Sterne Agee Group, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  | $ 29,300 |  |  |

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