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Contingencies - Narrative (Details) ₪ in Millions						1 Months Ended		3 Months Ended	6 Months Ended
	May 28, 2017 USD ($)	Jan. 27, 2017 USD ($)	Feb. 17, 2015 USD ($)	Feb. 09, 2015 USD ($)	Jan. 27, 2015 USD ($)	Aug. 31, 2013 USD ($)	Aug. 31, 2013 ILS (₪)	Mar. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Auction Rate Securities Committed To Purchase related to settlements with regulators									$ 5,000,000
Amount Of Auction Rate Securities Firm Purchased And Hold Net of Redemptions									109,200,000
Auction Rate Securities Committed To Purchase From Clients under Legal Settlements and Awards									10,000,000
Eligible investor subject to future buyback potential additional losses related to valuation adjustments									29,400,000
Eligible Investor Subject To Future Buyback Potential Additional Losses Related To Valuation Adjustments									0
Israel Value-Added Tax Authority Case [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Provision								$ 8,000,000
SEC [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount					$ 10,000,000
Payments for legal settlements		$ 5,000,000	$ 5,000,000
SEC [Member] | Disgorgement [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount					4,200,000
SEC [Member] | Prejudgment Interest [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount					753,500
SEC [Member] | Civil Penalties [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount					5,100,000
United States Department of the Treasury [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount		$ 5,000,000			$ 10,000,000
Payments for legal settlements				$ 5,000,000
Minimum [Member]
Loss Contingencies [Line Items]
Maximum estimated range of aggregate loss for legal proceedings									0
Maximum [Member]
Loss Contingencies [Line Items]
Maximum estimated range of aggregate loss for legal proceedings									$ 34,000,000
Auction Rate Securities [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Commitment to purchase ARS period maximum									2020
Oppenheimer Israel [Member] | Israel Value-Added Tax Authority Case [Member]
Loss Contingencies [Line Items]
Payments for legal settlements	$ 8,000,000
Pending Litigation [Member] | Israel Value-Added Tax Authority Case [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount						$ (5,800,000)	₪ (21)

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 25
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