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Financial instruments - Notional and Fair Values of TBAs (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Fair Value Of To Be Announced Securities [Abstract] |  |
Notional Amount, Sale of TBAs | $ 345,168 | $ 449,065
Notional Amount, Purchase of TBAs | 44,749 | 117,573
Notional Amount, Funding Commitments | 264,035 | 304,390
Notional Amount, Total | 308,784 | 421,963
Fair Value, Sale of TBAs | 3,111 | 3,188
Fair Value, Purchase of TBAs | $ 281 | $ 175

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