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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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- Definition Auction Rate Securities Committed To Purchase related to settlements with regulators + References No definition available. + Details
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- Definition Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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