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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]
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
AAA to CC Rated CMBS [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Coupon 5.90%  
Yield 6.60%  
Weighted Average Life 1 year 8 months 12 days  
AAA to CCC- Rated CMBS [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Coupon   5.90%
Yield   6.40%
Weighted Average Life   2 years 3 months 18 days