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Fair Value of Portfolio of Life Insurance Policies (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Life Insurance Premiums and Related Investment Income [Line Items]    
Average age of insured 78 years 77 years
Average life expectancy, months 148 months [1] 155 months [1]
Average face amount per policy $ 6,703 $ 6,703
Fair value discount rate 7.50% 7.50%
Internal rate of return 15.60% [2] 14.10% [2]
[1] Mortality rates: standard life expectancy as adjusted for insured's specific circumstances.
[2] Internal rate of return includes a risk premium which represents risk adjustments applied to the estimated present value of cash flows based on the following factors: (i) the volatility in life expectancy of insureds and the associated level of future premium payments and (ii) the projected risk of non-payment, including the financial health of the insurance carrier, the possibility of legal challenges from the insurance carrier or others and the possibility of regulatory changes that may affect payment.