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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 | Dec. 31, 2013 | Dec. 31, 2012
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Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | $ 663,565 | $ 1,525,881
Gross Amounts Offset, Assets | (204,614) | (1,160,239)
Net Amounts of Assets Presented on the Balance Sheet | 458,951 | 365,642
Financial Instruments | (449,241) | (353,341)
Cash Collateral Received |  |
Net Amount | 9,710 | 12,301
Gross Amounts of Recognized Liabilities | 1,173,726 | 1,743,017
Gross Amounts Offset, Liabilities | (204,614) | (1,160,239)
Net Amounts of Liabilities Presented on the Balance Sheet | 969,112 | 582,778
Financial Instruments | (957,974) | (565,524)
Cash Collateral Pledged |  |
Net Amount | 11,138 | 17,254
Reverse Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 389,438 | 1,160,239
Gross Amounts Offset, Assets | (204,614) | (1,160,239)
Net Amounts of Assets Presented on the Balance Sheet | 184,824 |
Financial Instruments | (183,305) |
Cash Collateral Received |  |
Net Amount | 1,519 |
Securities Borrowed [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 274,127 | 365,642
Gross Amounts Offset, Assets |  |
Net Amounts of Assets Presented on the Balance Sheet | 274,127 | 365,642
Financial Instruments | (265,936) | (353,341)
Cash Collateral Received |  |
Net Amount | 8,191 | 12,301
Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 962,105 | 1,552,630
Gross Amounts Offset, Liabilities | (204,614) | (1,160,239)
Net Amounts of Liabilities Presented on the Balance Sheet | 757,491 | 392,391
Financial Instruments | (753,003) | (377,737)
Cash Collateral Pledged |  |
Net Amount | 4,488 | 14,654
Securities Loaned [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 211,621 | 190,387
Gross Amounts Offset, Liabilities |  |
Net Amounts of Liabilities Presented on the Balance Sheet | 211,621 | 190,387
Financial Instruments | (204,971) | (187,787)
Cash Collateral Pledged |  |
Net Amount | $ 6,650 | $ 2,600

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