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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
	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%

X

- 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

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- Definition

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