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Financial Instruments - Notional and Fair Values of TBAs (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Fair Value Of To Be Announced Securities [Abstract] |  |
Notional Amount, Sale of TBAs | $ 544,641 | $ 449,065
Notional Amount, Purchase of TBAs | 100,018 | 117,573
Notional Amount, Funding Commitments | 405,538 | 304,390
Notional Amount, Total | 505,556 | 421,963
Fair Value, Sale of TBAs | 1,750 | 3,188
Fair Value, Purchase of TBAs | $ 1,599 | $ 175

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