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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) | 3 Months Ended
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Mar. 31, 2014 | Mar. 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 2006 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 3.00% | 3.00%
Available-for-sale Securities [Member] | Vintage Concentration Risk [Member] | Vintage 2007 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 97.00% | 97.00%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 36.00% | 35.50%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 24.00% | 24.10%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Hotel [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 13.80% | 13.70%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Multifamily [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 12.10% | 12.70%
Available-for-sale Securities [Member] | Product Concentration Risk [Member] | Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 14.10% | 14.00%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | South Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 23.80% | 23.40%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 23.00% | 22.80%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 17.00% | 17.60%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | East North Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 10.30% | 0.00%
Available-for-sale Securities [Member] | Geographic Concentration Risk [Member] | Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 25.90% | 36.20%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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