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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 405,598	$ 359,984
Expenses	274,340	251,862
Operating profit (loss)	131,258	108,122
Private Banks [Member]
Segment Reporting Information [Line Items]
Revenues	122,164	112,634
Expenses	112,202	108,550
Operating profit (loss)	9,962	4,084
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Revenues	99,192	88,238
Expenses	52,453	47,539
Operating profit (loss)	46,739	40,699
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Revenues	85,491	77,004
Expenses	41,249	38,828
Operating profit (loss)	44,242	38,176
Investment Managers [Member]
Segment Reporting Information [Line Items]
Revenues	96,855	80,487
Expenses	63,338	52,065
Operating profit (loss)	33,517	28,422
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Revenues	1,896	1,621
Expenses	5,098	4,880
Operating profit (loss)	$ (3,202)	$ (3,259)

X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

+ References

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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