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Commitments and Contingencies - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 31, 2013 Pending Litigation [Member] | Dec. 31, 2012 Auction Rate Securities [Member]
Loss Contingencies [Line Items] |  |  |  |  |
Operating leases expiring at various dates through | 2028 |  |  |  |
Rent expense | $ 51,200,000 | $ 49,500,000 | $ 50,400,000 |  |
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 | 125,500,000 |  |  |  |
Total amount of ARS the firm purchased and hold |  |  |  |  | 77,100,000
Amount of ARS committed to purchase from clients |  |  |  |  | 38.3
ARS in firm proprietary account |  |  |  |  | 150,000
Contingency damages amount | 30,000,000 |  |  | 30,000,000 |
Claim amount including interest and costs |  |  |  | 140,000,000 |
Initial claim amount including interest and costs |  |  |  | $ 253,000,000 |

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