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Financial Instruments - Notional Amounts and Fair Values of Derivatives by Product (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | $ 439,949 | $ 407,246
Derivatives asset, Fair Value | 7,285 | 4,530
Derivative liability, notional | 4,874,151 | 7,188,207
Derivative liability, Fair Value | 4,542 | 6,574
Commodity Contracts [Member] | U.S. Treasury Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 72,000 | 60,000
Derivative liability, Fair Value | 87 | 186
Commodity Contracts [Member] | Federal Funds Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 3,950,000 | 6,155,000
Derivative liability, Fair Value | 135 | 18
Commodity Contracts [Member] | general collateral futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 225,000 |
Derivative liability, Fair Value | 2 |
Commodity Contracts [Member] | Euro Dollars Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 300,000 | 347,000
Derivative liability, Fair Value | 60 | 44
Other Contracts [Member] | Interest Rate Lock Commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 139,947 | 115,569
Derivatives asset, Fair Value | 5,511 | 2,375
Derivative liability, notional | 51,106 | 76,604
Derivative liability, Fair Value | 3,188 | 3,653
Other Contracts [Member] | Forward Start Repurchase Agreement [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 181,000 |
Other Contracts [Member] | Tba [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 86,631 | 25,262
Derivatives asset, Fair Value | 63 | 134
Derivative liability, notional | 81,973 | 14,547
Derivative liability, Fair Value | 33 | 73
Other Contracts [Member] | Tba Sale Agreements [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 213,371 | 266,415
Derivatives asset, Fair Value | 1,711 | 2,021
Other Contracts [Member] | Forward Start Repurchase Agreement [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional |  | 506,000
Other Contracts [Member] | Auction Rate Securities Purchase Commitment [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 13,072 | 29,056
Derivative liability, Fair Value | $ 1,037 | $ 2,600

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