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Financial instruments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 Bank ForwardContracts | Dec. 31, 2011 | Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loan position held in secondary loan trading portfolio | $ 0 | $ 0 |
Fair value of the reverse repurchase agreements |  |  |
Fair value of the repurchase agreements |  |  |
Interest rate swap expiration date | Dec. 31, 2012 |  |
Net gain on the interest rate swaps, after tax |  | 69,000 | 450,900
Senior Secured Credit Note reference rate description | 3-Month LIBOR |  |
Derivatives instruments gain recognized income | 28,000 |  |
Number of foreign exchange option outstanding | 0 |  |
Forward or delayed delivery of the underlying instrument with settlement | 180 days |  |
Bank call loans | 128,300,000 | 27,500,000 |
Number of money center banks | 2 |  |
Customer securities under customer margin loans available to be pledged | 1,500,000,000 |  |
Amount repledged of customer securities under customer margin loan | 171,200,000 |  |
Customer securities deposited to secure obligations and margin requirements under option contracts | 339,800,000 |  |
Outstanding letters of credit | 0 |  |
Gross balances of reverse repurchase agreements | 1,200,000,000 | 5,500,000,000 |
Gross balances of repurchase agreements | 1,600,000,000 | 6,100,000,000 |
Carrying value of pledged securities owned that can be sold or re-pledged by the counterparty | 570,000,000 | 653,700,000 |
Carrying value of securities owned by the Company loaned or pledged | 159,400,000 | 119,800,000 |
U.S. Treasury Notes Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Number of open short contract | 380 |  |
Open short contract, period | 10 years |  |
Open contracts for Federal Funds futures with a fair value | 286,000,000 |  |
Federal Funds [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Open contracts for Federal Funds futures | 6,000,000,000 |  |
Open contracts for Federal Funds futures with a fair value | 120,000,000 |  |
Corporate [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Collateralized loans, collateralized by firm | 158,200,000 |  |
Other Than Corporate Customer [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Collateralized loans, collateralized by customer securities | 225,800,000 |  |
Reverse Repurchase Agreement [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Amount repledged of customer securities under customer margin loan | 14,300,000 | 44,000,000 |
Securities received as collateral under securities borrowed transaction with market value | 354,000,000 | 209,900,000 |
Securities Borrowed Transactions [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Amount repledged of customer securities under customer margin loan | 1,200,000,000 | 5,500,000,000 |
Securities received as collateral under securities borrowed transaction with market value | 1,200,000,000 | 5,500,000,000 |
Two Major U.S Broker [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Receivable from brokers and clearing organizations | 78,600,000 |  |
Lehman Brothers International Europe [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Lehman Brothers International (Europe) held securities with a fair value | 7,500,000 |  |
Credit Concentration Risk [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Utilization of warehouse facility | 0 | 65,900,000 |
Warehouse facility excess retention |  |  |
Guaranteed mortgages for a period | 10 days |  |
Outstanding under the warehouse facility line | 8,100,000 |  |
Variable interest rate under warehouse facility | 1 month LIBOR plus 1.85% |  |
Variable interest rate | 1.85% |  |
Interest expense | 895,000.0 | 1,700,000 |
Deferred Compensation Share Based Payments [Member] | Corporate equities liabilities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fair value of the corporate equities that are included in securities owned | 14,000,000 | 13,200,000 |
Senior Secured Credit Note [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Senior Secured Credit Note reference rate description | 3-Month LIBOR |  |
Swaps [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Interest rate swap expiration date |  | Mar. 31, 2011 |
Interest Rate Cap [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Interest expense | 19,780 |  |
Auction Rate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Company purchased and holds auction rate securities | 77,100,000 |  |
Commitment to purchase ARS from clients through 2016 | 38,300,000 |  |
ARS held in proprietary trading account result of the failed auctions | 150,000 |  |
Valuation adjustment (unrealized loss) for ARS | 7,700,000 |  |
Assets and liabilities transferred from level one and level two | $ 0 |  |
Auction Rate Securities [Member] | Maximum [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Commitment to purchase ARS period maximum | 2016 |  |

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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -Clause 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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