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Commitments and Contingencies - Additional Information (Details) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 27, 2017 | Feb. 17, 2015 | Feb. 09, 2015 | Jan. 27, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Operating leases expiring at various dates through |  |  |  |  | 2028 |  |
Rent expense |  |  |  |  | $ 45,900,000 | $ 45,600,000 | $ 46,400,000
Capital commitments relating to investments |  |  |  |  | 5,100,000 |  |
Minimum estimated range of aggregate loss for legal proceedings |  |  |  |  | 0 |  |
Maximum estimated range of aggregate loss for legal proceedings |  |  |  |  | 51,000,000.0 |  |
Auction rate securities related to settlements with regulators |  |  |  |  | 5,000,000 |  |
Eligible investor subject to future buyback principal value |  |  |  |  | 57,000,000 |  |
Eligible investor subject to future buyback potential additional losses related to valuation adjustments |  |  |  |  | 0 |  |
Litigation settlement, expense |  |  |  |  | 10,000,000 |  |
SEC |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation settlement, amount |  |  |  | $ 10,000,000.0 |  |  |
Payments for legal settlements |  | $ 5,000,000 |  |  |  |  |
SEC | Scenario, Forecast |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Payments for legal settlements | $ 5,000,000 |  |  |  |  |  |
SEC | Disgorgement |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation settlement, amount |  |  |  | 4,200,000.0 |  |  |
SEC | Prejudgment Interest |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation settlement, amount |  |  |  | 753,500 |  |  |
SEC | Civil Penalties |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation settlement, amount |  |  |  | 5,100,000.0 |  |  |
United States Department of the Treasury |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Litigation settlement, amount |  |  |  | $ 10,000,000 |  |  |
Payments for legal settlements |  |  | $ 5,000,000 |  |  |  |
Auction rate securities |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Total amount of ARS the firm purchased and hold |  |  |  |  | 92,000,000 |  |
Amount of ARS committed to purchase from clients |  |  |  |  | $ 22,800,000 |  |

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