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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
	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 Discount Rate

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Available-for-sale Debt Securities, Weighted Average Expected Term

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Available-for-sale Debt Securities, Weighted Average Interest Rate

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