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Collateralized Transactions - Schedule of Gross Amounts and Offsetting Amounts of Reverse Repurchase Agreements, Repurchase Agreements, Securities Borrowed and Securities Lending Transactions (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Securities Financing Transaction [Line Items] |  |
Net Amounts of Assets Presented on the Balance Sheet | $ 250,548 | $ 184,825
Net Amounts of Liabilities Presented on the Balance Sheet | 705,727 | 757,491
Gross Amounts of Recognized Assets | 578,418 | 663,566
Gross Amounts Offset in the Balance Sheet | (95,880) | (204,614)
Net Amounts of Assets Presented on the Balance Sheet | 482,538 | 458,952
Financial Instruments | (476,854) | (449,241)
Cash Collateral Received |  |
Net Amount | 5,684 | 9,711
Gross Amounts of Recognized Liabilities | 1,010,760 | 1,173,726
Gross Amounts Offset in the Balance Sheet | (95,880) | (204,614)
Net Amounts of Liabilities Presented on the Balance Sheet | 914,880 | 969,112
Financial Instruments | (908,301) | (957,974)
Cash Collateral Pledged |  |
Net Amount | 6,579 | 11,138
Reverse Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 346,428 | 389,439
Gross Amounts Offset in the Balance Sheet | (95,880) | (204,614)
Net Amounts of Assets Presented on the Balance Sheet | 250,548 | 184,825
Financial Instruments | (250,000) | (183,305)
Cash Collateral Received |  |
Net Amount | 548 | 1,520
Securities Borrowed [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 231,990 | 274,127
Gross Amounts Offset in the Balance Sheet |  |
Net Amounts of Assets Presented on the Balance Sheet | 231,990 | 274,127
Financial Instruments | (226,854) | (265,936)
Cash Collateral Received |  |
Net Amount | 5,136 | 8,191
Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 801,607 | 962,105
Gross Amounts Offset in the Balance Sheet | (95,880) | (204,614)
Net Amounts of Liabilities Presented on the Balance Sheet | 705,727 | 757,491
Financial Instruments | (704,687) | (753,003)
Cash Collateral Pledged |  |
Net Amount | 1,040 | 4,488
Securities Loaned [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 209,153 | 211,621
Gross Amounts Offset in the Balance Sheet |  |
Net Amounts of Liabilities Presented on the Balance Sheet | 209,153 | 211,621
Financial Instruments | (203,614) | (204,971)
Cash Collateral Pledged |  |
Net Amount | $ 5,539 | $ 6,650

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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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