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Debt Securities - Overall Statistics for Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Detail) (Commercial Mortgage Backed Securities [Member]) | 12 Months Ended
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Dec. 31, 2013 AAA-CCC Rated CMBS [Member] | Dec. 31, 2012 AAA Rated CMBS [Member]
Schedule of Available-for-sale Securities [Line Items] |  |
Coupon | 5.80% | 5.60%
Yield | 5.30% | 4.10%
Weighted Average Life | 3 years 1 month 6 days | 1 year 9 months 18 days

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- Definition Available-for-sale Debt Securities, Weighted Average Expected Term + References No definition available. + Details
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- Definition Available-for-sale Debt Securities, Weighted Average Interest Rate + References No definition available. + Details
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- Details
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