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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) - Available-for-sale Securities [Member] | 3 Months Ended | 12 Months Ended
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Mar. 31, 2016 | Dec. 31, 2015
Vintage Concentration Risk [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 100.00% | 100.00%
Vintage Concentration Risk [Member] | Vintage 2005 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 7.20% | 8.30%
Vintage Concentration Risk [Member] | Vintage 2006 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 21.00% | 20.00%
Vintage Concentration Risk [Member] | Vintage 2007 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 62.60% | 62.40%
Vintage Concentration Risk [Member] | Vintage 2008 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 9.20% | 9.30%
Product Concentration Risk [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 100.00% | 100.00%
Product Concentration Risk [Member] | Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 33.00% | 32.00%
Product Concentration Risk [Member] | Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 30.00% | 30.20%
Product Concentration Risk [Member] | Multifamily [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 13.30% | 13.50%
Product Concentration Risk [Member] | Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 23.70% | 24.30%
Geographic Concentration Risk [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 100.00% | 100.00%
Geographic Concentration Risk [Member] | South Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 22.30% | 23.00%
Geographic Concentration Risk [Member] | Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 18.60% | 18.10%
Geographic Concentration Risk [Member] | Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 17.70% | 17.80%
Geographic Concentration Risk [Member] | East North Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 12.20% | 12.50%
Geographic Concentration Risk [Member] | Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 29.20% | 28.60%

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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 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 Reference 2: 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=35750535&loc=d3e13531-108611 Reference 3: 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 4: 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=35750535&loc=d3e13537-108611 + Details
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