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Commitments and Contingencies - Additional Information (Narrative) (Details) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 27, 2017 | Feb. 17, 2015 | Feb. 09, 2015 | Jan. 27, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Operating leases expiring at various dates through |  |  |  |  |  | 2028 |  |
Rent expense |  |  |  |  |  | $ 45,600,000 | $ 44,400,000 | $ 45,900,000
Unfunded Commitments |  |  |  |  |  | 1,400,000 |  |
Eligible investor subject to future buyback principal value |  |  |  |  |  | 25,300,000 |  |
Auction rate securities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Total amount of ARS the firm purchased and hold |  |  |  |  |  | 113,900,000 |  |
Amount of ARS committed to purchase from clients |  |  |  |  |  | 11,000,000 |  |
SEC |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party |  |  |  |  | $ 10,000,000 |  |  |
Payments for Legal Settlements |  | $ 5,000,000 | $ 5,000,000 |  |  |  |  |
SEC | Unfavorable Regulatory Action, Disgorgement |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  | 4,200,000 |  |  |
SEC | Unfavorable Regulatory Action, Prejudgment Interest |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement Interest |  |  |  |  | 753,500 |  |  |
SEC | Unfavorable Regulatory Action, Civil Penalties |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  | 5,100,000 |  |  |
United States Department of the Treasury |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party |  |  |  |  | $ 10,000,000 |  |  |
Payments for Legal Settlements |  | $ 5,000,000 |  | $ 5,000,000 |  |  |  |
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 |  |  |  |  |  | 37,000,000 |  |
Private Equity Funds [Member] |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Unfunded Commitments | [1] |  |  |  |  | $ 1,400,000 |  |
[1] | Includes private equity funds and private equity fund of funds with a focus on diversified portfolios, real estate and global natural resources. Due to the illiquid nature of these funds, investors are not permitted to make withdrawals without the consent of the general partner. The lock-up period of the private equity funds can extend to 10 years.

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