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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], AAA-CCC Rated CMBS [Member]) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Dec. 31, 2013
Commercial Mortgage Backed Securities [Member] | AAA-CCC Rated CMBS [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Coupon | 5.80% | 5.80%
Yield | 6.30% | 5.30%
Weighted Average Life | 2 years 6 months 0 days | 3 years 1 month 12 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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