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Derivative Instruments - Summary of Gross Fair Values of Individual Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | $ 178,447 | $ 199,370
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 571,382 | 604,579
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets | 65,636 | 73,264
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities | 65,636 | 73,264
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 112,811 | 126,106
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 505,746 | 531,315
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets |  |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 148,836 | 180,113
Net Amount, Derivative Assets | 112,811 | 126,106
Net Amount, Derivative Liabilities | 356,910 | 351,202
Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,317,625 | 2,221,781
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 2,317,625 | 2,221,781
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amount, Derivative Liabilities | 2,317,625 | 2,221,781
Interest rate swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets | 178,447 | 198,117
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 366,949 | 390,774
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets | 65,636 | 73,264
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities | 65,636 | 73,264
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets | 112,811 | 124,853
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 301,313 | 317,510
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets |  |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 147,925 | 180,113
Net Amount, Derivative Assets | 112,811 | 124,853
Net Amount, Derivative Liabilities | 153,388 | 137,397
Interest rate swaps [Member] | Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 2,231,863 | 2,131,315
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 2,231,863 | 2,131,315
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amount, Derivative Liabilities | 2,231,863 | 2,131,315
Futures contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Assets, Derivative Assets |  | 1,253
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 911 | 0
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Assets |  |
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amounts of Assets Presented in the Consolidated Balance Sheet, Derivative Assets |  | 1,253
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 911 | 0
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Assets |  |
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities | 911 |
Net Amount, Derivative Assets |  | 1,253
Net Amount, Derivative Liabilities |  | 0
Credit derivatives [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 203,307 | 213,585
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 203,307 | 213,585
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amount, Derivative Liabilities | 203,307 | 213,585
Other Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 215 | 220
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 215 | 220
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amount, Derivative Liabilities | 215 | 220
Currency swaps [Member] | Variable Interest Entities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross Amounts of Recognized Liabilities, Derivative Liabilities | 85,762 | 90,466
Gross Amounts Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amounts of Liabilities Presented in the Consolidated Balance Sheet, Derivative Liabilities | 85,762 | 90,466
Gross Amount of Collateral Received/Pledged Not Offset in the Consolidated Balance Sheet, Derivative Liabilities |  |
Net Amount, Derivative Liabilities | $ 85,762 | $ 90,466

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- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 + Details
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