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Concentrations of Credit Risk - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Concentration Risk [Line Items] |  |  |
Securities Purchased Under Agreements to Resell | $ 19,134 | $ 0 |
Securities Sold Under Agreements to Repurchase | 75,563 | 120,787 |
Total receivable | 83,347 | 89,098 |
Investment banking and investment management receivables collection periods (in days) | 90 days |  |
Collection period for restructuring transactions and private equity fee receivables (in days) | 90 days |  |
Bad debt expense | 2,099 | 1,803 | 1,558
Marketable Securities | 43,407 | 36,545 |
Percentage of marketable securities related to corporate and municipal bonds and other debt securities (as percent) | 52.00% |  |
Percentage of marketable securities related to seed capital investments and mutual funds (as a percent) | 48.00% |  |
Asset (Liability) Balance [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Securities Purchased Under Agreements to Resell | 19,134 | 0 |
Securities Sold Under Agreements to Repurchase | 75,563 | 120,787 |
Market Value of Collateral Received or (Pledged) [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Securities Purchased Under Agreements to Resell | 19,112 | 0 |
Securities Sold Under Agreements to Repurchase | $ 75,708 | $ 121,029 |

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement and assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.3) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(2)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1(i) -Article 4 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Article 9 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7472769&loc=d3e9760-107771 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 2 -Article 4 + Details
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