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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])
6 Months Ended 12 Months Ended
Jun. 30, 2014
AAA-CCC Rated CMBS [Member]
Dec. 31, 2013
AAA 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 9 months 18 days 3 years 1 month 12 days