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Commitments and Contingencies - Additional Information (Narrative) (Details) - USD ($) |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 27, 2017 | Nov. 30, 2016 | Feb. 17, 2015 | Feb. 09, 2015 | Jan. 27, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Operating leases expiring at various dates through |  |  |  |  |  | 2028 |  |
Rent expense |  |  |  |  |  | $ 44,400,000 | $ 45,900,000 | $ 45,600,000
Capital Commitments Relating To Investments |  |  |  |  |  | 1,300,000 |  |
Purchase Commitments Outstanding, Auction Rate Securities Related to Settlements with Regulators |  |  |  |  |  | 5,000,000 |  |
Eligible investor subject to future buyback principal value |  |  |  |  |  | 33,400,000 |  |
Auction rate securities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total amount of ARS the firm purchased and hold |  |  |  |  |  | 88,100,000 |  |
Amount of ARS committed to purchase from clients |  |  |  |  |  | 26,000,000 |  |
SEC |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  | $ (10,000,000) |  |  |
Payments for Legal Settlements |  |  | $ 5,000,000 |  |  |  |  |
SEC | Unfavorable Regulatory Action, Disgorgement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  | (4,200,000) |  |  |
SEC | Unfavorable Regulatory Action, Prejudgment Interest |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  | (753,500) |  |  |
SEC | Unfavorable Regulatory Action, Civil Penalties |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  | (5,100,000) |  |  |
United States Department of the Treasury |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  |  |  |  | $ (10,000,000) |  |  |
Payments for Legal Settlements |  |  |  | $ 5,000,000 |  |  |  |
FINRA [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments for Legal Settlements |  | $ 1,600,000 |  |  |  |  |  |
Payments for Legal Settlements, Restitution to Eligible Clients |  | $ 1,800,000 |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Maximum estimated range of aggregate loss for legal proceedings |  |  |  |  |  | 0 |  |
Eligible investor subject to future buyback potential additional losses related to valuation adjustments |  |  |  |  |  | 0 |  |
Maximum [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Maximum estimated range of aggregate loss for legal proceedings |  |  |  |  |  | $ 47,000,000 |  |
Scenario, Forecast [Member] | SEC |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments for Legal Settlements | $ 5,000,000 |  |  |  |  |  |  |
Scenario, Forecast [Member] | United States Department of the Treasury |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payments for Legal Settlements | $ 5,000,000 |  |  |  |  |  |  |

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