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Debt Securities - Overall Statistics for Company's AAA-rated CMBS Investments Calculated on Weighted Average Basis (Detail) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012
Investments Debt And Equity Securities [Abstract] |  |
Coupon | 5.60% | 5.60%
Yield | 4.60% | 4.10%
Weighted Average Life | 1 year 9 months 18 days | 1 year 9 months 18 days

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- Definition Yield + References No definition available. + Details
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- Details
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