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Financial instruments - Notional and Fair Values of TBAs (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Notional, Sale of TBAs	$ 449,065	$ 574,365
Notional, Purchase of TBAs	117,573	137,572
Fair Value, Sale of TBAs	3,188	5,791
Fair Value, Purchase of TBAs	$ 175	$ 2,254

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- Definition

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+ References

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+ Details

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- Definition

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+ References

No definition available.

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- Definition

Notional amount purchase of to be announced securities.

+ References

No definition available.

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- Definition

Notional amount sale of to be announced securities.

+ References

No definition available.

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