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Commitments and Contingencies - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Loss Contingencies [Line Items] |  |  |  |  |
Operating leases expiring at various dates through |  |  | 2028 |  |
Rent expense |  |  | $ 46,400,000 | $ 51,200,000 | $ 49,500,000
Rent abatement credits |  | 1,700,000 |  |  |
Capital commitments |  |  | 5,100,000 |  |
Minimum estimated range of aggregate loss for legal proceedings |  |  | 0 |  |
Maximum estimated range of aggregate loss for legal proceedings |  |  | 25,000,000 |  |
Eligible investor subject to future buyback principal value |  |  | 126,200,000 |  |
Eligible investor subject to future buyback potential additional losses related to valuation adjustments |  |  | 0 |  |
Period of auction rates security to be purchased from rendering of the award |  |  | 30 days |  |
Contingency damages amount | 30,000,000 |  |  |  |
Claim amount including interest and costs | 140,000,000 |  |  |  |
Initial claim amount including interest and costs | 253,000,000 |  |  |  |
Auction Rate Securities [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Total amount of ARS the firm purchased and hold |  |  | 91,600,000 |  |
Amount of ARS committed to purchase from clients |  |  | 29,100,000 |  |
ARS in firm proprietary account |  |  | 150,000 |  |
Fair amount of ARS committed to purchase from clients |  |  | 26,500,000 |  |
Auction rate securities derivative liability |  |  | $ 2,600,000 |  |
Office Building [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Number of principal offices |  | 2 |  | 2 |

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- Definition The amount of ARS the firm committed to purchase from clients. + References No definition available. + Details
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- Definition ARS in firm's proprietary account as a result of the failed auctions. + References No definition available. + Details
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