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Financial instruments - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  | 3 Months Ended |  | 12 Months Ended |  | 3 Months Ended |  |  |  |  | 3 Months Ended |  | 3 Months Ended
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Mar. 31, 2013 Bank ForwardContracts | Dec. 31, 2012 | Mar. 31, 2013 U.S. Treasury Notes Securities [Member] Contract | Mar. 31, 2013 Deferred Compensation Share Based Payments [Member] Corporate equities liabilities [Member] | Dec. 31, 2012 Deferred Compensation Share Based Payments [Member] Corporate equities liabilities [Member] | Mar. 31, 2013 Interest Rate Cap [Member] | Mar. 31, 2013 Fixed income investments [Member] U.S. Treasury Notes Securities [Member] | Dec. 31, 2012 Senior Secured Credit Note [Member] | Mar. 31, 2013 Corporate [Member] | Mar. 31, 2013 Other Than Corporate Customer [Member] | Mar. 31, 2012 Credit Concentration Risk [Member] | Mar. 31, 2013 Credit Concentration Risk [Member] | Mar. 31, 2013 Reverse repurchase agreement [Member] | Dec. 31, 2012 Reverse repurchase agreement [Member] | Mar. 31, 2013 Securities Borrowed Transactions [Member] | Dec. 31, 2012 Securities Borrowed Transactions [Member] | Mar. 31, 2013 Warehouse Facility [Member] Credit Concentration Risk [Member] | Mar. 31, 2013 Lehman Brothers International Europe [Member] | Mar. 31, 2013 Three Major U.S. Broker [Member] | Mar. 31, 2013 Auction Rate Securities [Member] | Mar. 31, 2013 Auction Rate Securities [Member] Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the corporate equities that are included in securities owned |  |  |  | $ 13,300,000 | $ 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company purchased and holds auction rate securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78,200,000 |
Commitment to purchase ARS from clients through 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,300,000 |
Commitment to purchase ARS period maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2016
ARS held in proprietary trading account result of the failed auctions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 |
Valuation adjustment (unrealized loss) for ARS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,900,000 |
Assets and liabilities transferred from level one and level two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Loan position held in secondary loan trading portfolio | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the reverse repurchase agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of the repurchase agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date of interest rate cap contract |  | December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Credit Note reference rate description |  |  |  |  |  |  |  | 3-Month LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 19,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of foreign exchange option outstanding | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward or delayed delivery of the underlying instrument with settlement | 180 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of open short contract |  |  | 388 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Open short contract, period |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Open contracts for Federal Funds futures |  |  | 1,466 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Open contracts for Federal Funds futures with a fair value |  |  | 71,000 |  |  |  | 360,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank call loans | 204,000,000 | 128,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateralized loans, collateralized by firm |  |  |  |  |  |  |  |  | 141,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Collateralized loans, collateralized by customer securities |  |  |  |  |  |  |  |  |  | 278,200,000 |  |  |  |  |  |  |  |  |  |  |
Number of money center banks | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer securities under customer margin loans available to be pledged | 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount repledged of customer securities under customer margin loan | 154,600,000 |  |  |  |  |  |  |  |  |  |  |  | 14,700,000 | 14,300,000 | 3,900,000,000 | 1,100,000,000 |  |  |  |  |
Customer securities deposited to secure obligations and margin requirements under option contracts | 336,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities received as collateral under securities borrowed transaction with market value |  |  |  |  |  |  |  |  |  |  |  |  | 181,300,000 | 354,000,000 | 3,900,000,000 | 1,200,000,000 |  |  |  |  |
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty | 391,900,000 | 570,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of securities owned by the Company loaned or pledged | 141,800,000 | 159,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lehman Brothers International (Europe) held securities with a fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |
Receivable from brokers and clearing organizations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 104,300,000 |  |
Guaranteed mortgages for a period |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |  |  |  |  |  |  |  |
Outstanding under the warehouse facility line |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 |  |  |  |  |  |  |  |  |
Variable interest rate under warehouse facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 month LIBOR plus 1.85% |  |  |  |
Variable interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | $ 243,000 |  |  |  |  |  | $ 219,600 |  |  |  |

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