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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])	3 Months Ended
	Mar. 31, 2014 AAA-CCC Rated CMBS [Member]	Mar. 31, 2013 AAA Rated CMBS [Member]
Schedule of Available-for-sale Securities [Line Items]
Coupon	5.80%	5.80%
Yield	5.40%	5.30%
Weighted Average Life	3 years 1 month 12 days	3 years 1 month 12 days

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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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