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Debt Securities - Percentage Vintage, Property Type, and Location of Collateral Securing Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Detail)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 100.00% 100.00%
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2005 [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 9.80% 0.00%
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2006 [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 19.60% 3.00%
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2007 [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 61.60% 97.00%
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2008 [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 9.00% 0.00%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Office [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 33.50% 33.20%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Retail [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 28.40% 25.10%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Multifamily [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 13.70% 15.30%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Hotel [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 9.30% 12.00%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Other [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 15.10% 14.40%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | South Atlantic [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 23.60% 23.40%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Middle Atlantic [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 20.90% 22.80%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Pacific [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 17.30% 17.60%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | East North Central [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 11.00% 0.00%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Other [Member]
    
Mortgage Loans on Real Estate [Line Items]    
Percentage Vintage 27.20% 36.20%