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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
	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%

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 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

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration