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Financial Instruments - Schedule of Trading Securities Sold, Not Yet Purchased (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Securities Sold Not Yet Purchased At Fair Value [Line Items] |  |
Trading securities sold, not yet purchased | $ 44,167 | $ 99,613
U.S. government agency MBS [Member] |  |
Securities Sold Not Yet Purchased At Fair Value [Line Items] |  |
Trading securities sold, not yet purchased | 13 | 16
U.S. Treasury securities [Member] |  |
Securities Sold Not Yet Purchased At Fair Value [Line Items] |  |
Trading securities sold, not yet purchased | 19,722 | 11,755
Corporate bonds and redeemable preferred stock [Member] |  |
Securities Sold Not Yet Purchased At Fair Value [Line Items] |  |
Trading securities sold, not yet purchased | 21,976 | 87,537
Foreign government bonds [Member] |  |
Securities Sold Not Yet Purchased At Fair Value [Line Items] |  |
Trading securities sold, not yet purchased |  | 158
Municipal bonds [Member] |  |
Securities Sold Not Yet Purchased At Fair Value [Line Items] |  |
Trading securities sold, not yet purchased | 128 | 143
Certificates of deposit [Member] |  |
Securities Sold Not Yet Purchased At Fair Value [Line Items] |  |
Trading securities sold, not yet purchased | 2,325 | 4
Equity securities [Member] |  |
Securities Sold Not Yet Purchased At Fair Value [Line Items] |  |
Trading securities sold, not yet purchased | $ 3 |

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- Definition Fair value of obligations incurred from short sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 38 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 19 -IssueDate 2006-05-01 -Chapter 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6475908&loc=d3e42429-110968 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 2 -IssueDate 2006-05-01 -Chapter 7 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 40 -IssueDate 2006-05-01 -Chapter 7 -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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