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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
	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%

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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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