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Investments - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Schedule of Investments [Line Items] |  |  |
Available for Sale Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss | $ 0 |  | $ 0
Fair value of fixed maturity securities, gross unrealized gain | 6,850,200,000 |  | 7,277,500,000
Fair Value of fixed maturity securities, gross unrealized loss | 46,300,000 |  | 56,000,000
Defaults on securities not OTTI | 0 |  |
Commitment to fund private placement fixed maturity securities | 153,000,000 |  |
Carrying amount of variable interest entity investments | 431,700,000 |  |
Unfunded commitment to fund Investment Partnerships | 75,700,000 |  |
Commitment to fund partnership Equity Investments | 107,800,000 |  |
Other Long-term Investments | 592,800,000 |  | 625,000,000
Commitments to Fund Special Purpose Entities | 0 |  |
Mortgage Loan policy is not to exceed a loan-to-value ratio, percent | 75.00% |  |
Loan to Value Ratio Update Frequency | 3 years |  |
Mortgage Loan Inspection Frequency | 2 years |  |
Mortage Loan Policy Debt Service coverage ratio lower range | 125.00% |  |
Mortgage Loans issuance, term years | 25 |  |
Impaired Financing Receivable, Average Recorded Investment | 17,400,000 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 200,000 | 200,000 |
Foreclosed Real Estate Expense | 0 | 0 |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing | 0 |  | 0
Financing Receivable, Recorder Investment, Nonaccrual status | 1 |  | 1
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 4,300,000 |  | 4,300,000
Committments to Fund Commercial Mortgage Loans | 48,200,000 |  |
Repurchase agreements - Typical Days outstanding | 30 |  |
Minimum percent of the fair value of securities loaned or securities purchased under repurchase agreements be maintained as collateral | 102.00% |  |
Securities Loaned | 234,000,000 |  | 452,800,000
Cash Collateral for Borrowed Securities | 236,300,000 |  | 455,800,000
Securities Received as Collateral | 0 |  | 0
Outstanding Repurchase Agreements | 0 |  | 0
Nonperforming Financing Receivable [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Amount of days past due-DelinquentMortgageLoan | 90 days |  | 90 days
Off Balance Sheet Amount [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Securities Received as Collateral | 6,500,000 |  | 14,500,000
Partnership Interests In Tax Credit Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Carrying amount of variable interest entity investments | 326,300,000 |  |
Equity Method Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Carrying amount of variable interest entity investments | 105,400,000 |  |
Bonds |  |  |
Schedule of Investments [Line Items] |  |  |
Fair value of fixed maturity securities | 141,800,000 |  |
Partnership Interest |  |  |
Schedule of Investments [Line Items] |  |  |
Other Long-term Investments | 6,700,000 |  |
External Credit Rating, Investment Grade |  |  |
Schedule of Investments [Line Items] |  |  |
Fair value of fixed maturity securities | 41,295,100,000 |  |
Fair value of fixed maturity securities, gross unrealized gain | 6,647,800,000 |  |
Fair Value of fixed maturity securities, gross unrealized loss | 27,800,000 |  |
Fixed maturity securities in unrealized loss position, percent of total | 60.00% |  |
Number of fixed maturity securities that were in an unrealized loss position | 64 |  |
Number of fixed maturity securities in an unrealized loss position continuously for over one year | 15 |  |
External Credit Rating, Non Investment Grade |  |  |
Schedule of Investments [Line Items] |  |  |
Fair value of fixed maturity securities | 3,141,400,000 |  |
Fair value of fixed maturity securities, gross unrealized gain | 202,400,000 |  |
Fair Value of fixed maturity securities, gross unrealized loss | 18,500,000 |  |
Fixed maturity securities in unrealized loss position, percent of total | 40.00% |  |
Number of fixed maturity securities that were in an unrealized loss position | 33 |  |
Number of fixed maturity securities in an unrealized loss position continuously for over one year | 14 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | 0 |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts |  |  | 1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  |  | $ 4,200,000

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- Definition The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7523297&loc=d3e113969-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 49 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 91 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 15 -Subparagraph a, b, c, d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 10 -Section 05 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7517284&loc=d3e93645-111703 + Details
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- Definition The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 100 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 36 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7472769&loc=d3e9760-107771 + Details
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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=7880789&loc=d3e5728-111685 + Details
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