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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) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 100.00% | 100.00%
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2006 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 3.00% | 1.00%
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2007 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 97.00% | 99.00%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 35.50% | 40.50%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 24.10% | 23.20%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Multifamily [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 13.70% | 10.50%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Hotel [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 12.70% | 12.90%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 14.00% | 12.90%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | South Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 23.40% | 21.80%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 22.80% | 21.40%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 17.60% | 23.80%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 36.20% | 33.00%

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