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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] | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Dec. 31, 2014
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 | 9.70% | 9.00%
Vintage Concentration Risk [Member] | Vintage 2006 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 19.40% | 19.00%
Vintage Concentration Risk [Member] | Vintage 2007 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 61.80% | 63.00%
Vintage Concentration Risk [Member] | Vintage 2008 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 9.10% | 9.00%
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 | 32.30% | 33.40%
Product Concentration Risk [Member] | Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 29.40% | 29.10%
Product Concentration Risk [Member] | Multifamily [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 13.30% | 13.30%
Product Concentration Risk [Member] | Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 25.00% | 24.20%
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 | 23.20% | 23.20%
Geographic Concentration Risk [Member] | Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 17.90% | 21.10%
Geographic Concentration Risk [Member] | Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 17.60% | 17.00%
Geographic Concentration Risk [Member] | East North Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 12.40% | 11.00%
Geographic Concentration Risk [Member] | Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage Vintage | 28.90% | 27.70%

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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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