Contingencies	6 Months Ended
Jun. 30, 2013
Commitments And Contingencies Disclosure [Abstract]
Contingencies	9. Contingencies Many aspects of the Company’s business involve substantial risks of liability. In the normal course of business, the Company has been named as defendant or co-defendant in various legal actions, including arbitrations, class actions, and other litigation, creating substantial exposure. Certain of the actual or threatened legal matters include claims for substantial compensatory and/or punitive damages or claims for indeterminate amounts of damages. These proceedings arise primarily from securities brokerage, asset management and investment banking activities. The Company is also involved, from time to time, in other reviews, investigations and proceedings (both formal and informal) by governmental and self-regulatory agencies regarding the Company’s business which may result in adverse judgments, settlements, fines, penalties, injunctions or other relief. The investigations include, among other things, inquiries from the SEC, the Financial Industry Regulatory Authority (“FINRA”) and various state regulators. The Company is named as a respondent in a number of arbitrations by its current or former clients as well as lawsuits related to its sale of ARS. The Company accrues for estimated loss contingencies related to legal and regulatory matters when available information indicates that it is probable a liability had been incurred at the date of the condensed consolidated financial statements and the Company can reasonably estimate the amount of that loss. In many proceedings, however, it is inherently difficult to determine whether any loss is probable or even possible or to estimate the amount of any loss. In addition, even where loss is possible or an exposure to loss exists in excess of the liability already accrued with respect to a previously recognized loss contingency, it is often not possible to reasonably estimate the size of the possible loss or range of loss or possible additional losses or range of additional losses. For certain legal and regulatory proceedings, the Company cannot reasonably estimate such losses, particularly for proceedings that are in their early stages of development or where plaintiffs seek substantial, indeterminate or special damages. Numerous issues may need to be reviewed, analyzed or resolved, including through potentially lengthy discovery and determination of important factual matters, and by addressing novel or unsettled legal questions relevant to the proceedings in question, before a loss or additional loss or range of loss or additional loss can be reasonably estimated for any proceeding. Even after lengthy review and analysis, the Company, in many legal and regulatory proceedings, may not be able to reasonably estimate possible losses or range of losses. For certain other legal and regulatory proceedings, the Company can estimate possible losses, or, ranges of loss in excess of amounts accrued, but does not believe, based on current knowledge and after consultation with counsel, that such losses individually or in the aggregate, will have a material adverse effect on the Company’s condensed consolidated financial statements as a whole. For legal proceedings where there is at least a reasonable possibility that a loss or an additional loss may be incurred, the Company estimates a range of aggregate loss in excess of amounts accrued of $0 to approximately $126 million. This estimated aggregate range is based upon currently available information for those legal proceedings in which the Company is involved, where an estimate for such losses can be made. For certain cases, the Company does not believe that an estimate can currently be made. The foregoing estimate is based on various factors, including the varying stages of the proceedings (including the fact that many are currently in preliminary stages), the numerous yet-unresolved issues in many of the proceedings and the attendant uncertainty of the various potential outcomes of such proceedings. Accordingly, the Company’s estimate will change from time to time, and actual losses may be more than the current estimate.

9. Contingencies

Many aspects of the Company’s business involve substantial risks of liability. In the normal course of business, the Company has been named as defendant or co-defendant in various legal actions, including arbitrations, class actions, and other litigation, creating substantial exposure. Certain of the actual or threatened legal matters include claims for substantial compensatory and/or punitive damages or claims for indeterminate amounts of damages. These proceedings arise primarily from securities brokerage, asset management and investment banking activities. The Company is also involved, from time to time, in other reviews, investigations and proceedings (both formal and informal) by governmental and self-regulatory agencies regarding the Company’s business which may result in adverse judgments, settlements, fines, penalties, injunctions or other relief. The investigations include, among other things, inquiries from the SEC, the Financial Industry Regulatory Authority (“FINRA”) and various state regulators. The Company is named as a respondent in a number of arbitrations by its current or former clients as well as lawsuits related to its sale of ARS.

The Company accrues for estimated loss contingencies related to legal and regulatory matters when available information indicates that it is probable a liability had been incurred at the date of the condensed consolidated financial statements and the Company can reasonably estimate the amount of that loss. In many proceedings, however, it is inherently difficult to determine whether any loss is probable or even possible or to estimate the amount of any loss. In addition, even where loss is possible or an exposure to loss exists in excess of the liability already accrued with respect to a previously recognized loss contingency, it is often not possible to reasonably estimate the size of the possible loss or range of loss or possible additional losses or range of additional losses.

For certain legal and regulatory proceedings, the Company cannot reasonably estimate such losses, particularly for proceedings that are in their early stages of development or where plaintiffs seek substantial, indeterminate or special damages. Numerous issues may need to be reviewed, analyzed or resolved, including through potentially lengthy discovery and determination of important factual matters, and by addressing novel or unsettled legal questions relevant to the proceedings in question, before a loss or additional loss or range of loss or additional loss can be reasonably estimated for any proceeding. Even after lengthy review and analysis, the Company, in many legal and regulatory proceedings, may not be able to reasonably estimate possible losses or range of losses.

For certain other legal and regulatory proceedings, the Company can estimate possible losses, or, ranges of loss in excess of amounts accrued, but does not believe, based on current knowledge and after consultation with counsel, that such losses individually or in the aggregate, will have a material adverse effect on the Company’s condensed consolidated financial statements as a whole.

For legal proceedings where there is at least a reasonable possibility that a loss or an additional loss may be incurred, the Company estimates a range of aggregate loss in excess of amounts accrued of $0 to approximately $126 million. This estimated aggregate range is based upon currently available information for those legal proceedings in which the Company is involved, where an estimate for such losses can be made. For certain cases, the Company does not believe that an estimate can currently be made. The foregoing estimate is based on various factors, including the varying stages of the proceedings (including the fact that many are currently in preliminary stages), the numerous yet-unresolved issues in many of the proceedings and the attendant uncertainty of the various potential outcomes of such proceedings. Accordingly, the Company’s estimate will change from time to time, and actual losses may be more than the current estimate.