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Commitments and Contingencies - Additional Information (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 07, 2019
Loss Contingencies [Line Items] |  |  |  |
Lease Expiration Date | Feb. 28, 2034 |  |  |
Rent expense | $ 44,700,000 | $ 45,600,000 | $ 44,400,000 |
Unfunded Commitments | 1,399,000 |  |  |
Eligible investor subject to future buyback principal value | 7,500,000 |  |  |
Auction rate securities |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Total amount of ARS the firm purchased and hold | 40,700,000 |  |  |
Amount of ARS committed to purchase from clients | 7,300,000 |  |  |
Subsequent Event [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Offer of Settlement with the SEC - SCSD Initiative |  |  |  | $ 3,500,000
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 | 30,000,000 |  |  |
Private Equity Funds [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Unfunded Commitments | $ 1,399,000 |  |  |

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