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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
	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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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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