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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 | Sep. 30, 2014 | Dec. 31, 2013
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Securities Financing Transaction [Line Items] |  |
Net Amounts of Assets Presented on the Balance Sheet | $ 250,000 | $ 184,825
Net Amounts of Liabilities Presented on the Balance Sheet | 688,310 | 757,491
Gross Amounts of Recognized Assets | 617,323 | 663,566
Gross Amounts Offset in the Balance Sheet | (99,680) | (204,614)
Net Amounts of Assets Presented on the Balance Sheet | 517,643 | 458,952
Financial Instruments | 508,001 | 449,241
Net Amount | 9,642 | 9,711
Gross Amounts of Recognized Liabilities | 952,085 | 1,173,726
Gross Amounts Offset in the Balance Sheet | (99,680) | (204,614)
Net Amounts of Liabilities Presented on the Balance Sheet | 852,405 | 969,112
Financial Instruments | 844,518 | 957,974
Net Amount | 7,887 | 11,138
Reverse Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 349,680 | 389,439
Gross Amounts Offset in the Balance Sheet | (99,680) | (204,614)
Net Amounts of Assets Presented on the Balance Sheet | 250,000 | 184,825
Financial Instruments | 250,000 | 183,305
Net Amount | 0 | 1,520
Securities Borrowed [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 267,643 | 274,127
Net Amounts of Assets Presented on the Balance Sheet | 267,643 | 274,127
Financial Instruments | 258,001 | 265,936
Net Amount | 9,642 | 8,191
Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 787,990 | 962,105
Gross Amounts Offset in the Balance Sheet | (99,680) | (204,614)
Net Amounts of Liabilities Presented on the Balance Sheet | 688,310 | 757,491
Financial Instruments | 686,659 | 753,003
Net Amount | 1,651 | 4,488
Securities Loaned [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 164,095 | 211,621
Net Amounts of Liabilities Presented on the Balance Sheet | 164,095 | 211,621
Financial Instruments | 157,859 | 204,971
Net Amount | $ 6,236 | $ 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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