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Financial Instruments - Notional Amounts and Fair Values of Derivatives by Product (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | $ 454,308 | $ 407,246
Derivatives asset, Fair Value | 12,422 | 4,530
Derivative liability, notional | 4,663,806 | 7,188,207
Derivative liability, Fair Value | 5,847 | 6,574
Commodity Contracts [Member] | U.S. Treasury Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 80,000 | 60,000
Derivative liability, Fair Value | 188 | 186
Commodity Contracts [Member] | Federal Funds Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 4,195,000 | 6,155,000
Derivative liability, Fair Value | 43 | 18
Commodity Contracts [Member] | Euro Dollars Futures [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, notional | 285,000 | 347,000
Derivative liability, Fair Value | 88 | 44
Other Contracts [Member] | Interest Rate Lock Commitments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 170,715 | 115,569
Derivatives asset, Fair Value | 10,528 | 2,375
Derivative liability, notional | 49,182 | 76,604
Derivative liability, Fair Value | 3,833 | 3,653
Other Contracts [Member] | Tba [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 44,515 | 25,262
Derivatives asset, Fair Value | 144 | 134
Derivative liability, notional | 34,412 | 14,547
Derivative liability, Fair Value | 181 | 73
Other Contracts [Member] | Tba Sale Agreements [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, Notional | 239,078 | 266,415
Derivatives asset, Fair Value | 1,750 | 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 | 20,212 | 29,056
Derivative liability, Fair Value | $ 1,514 | $ 2,600

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