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Investments - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Schedule of Investments [Line Items] |  |  |
Fair value of fixed maturity securities, gross unrealized gain | $ 6,068,200,000 | $ 3,726,400,000 |
Fair Value of fixed maturity securities, gross unrealized loss | 222,200,000 | 237,400,000 |
Defaults on securities not OTTI | 0 |  |
Commitment to fund private placement fixed maturity securities | 35,000,000 |  |
Carrying amount of variable interest entity investments | 428,300,000 |  |
Unfunded commitment to fund Investment Partnerships | 160,600,000 |  |
Commitment to fund partnership Equity Investments | 65,400,000 |  |
Other Long-term Investments | 639,200,000 | 529,300,000 |
Commitments to fund special purpose entity | 500,000 |  |
Mortgage Loan policy is not to exceed a loan-to-value ratio, percent | 75.00% |  |
Mortage Loan Policy Debt Service coverage ratio lower range | 125.00% |  |
Mortgage Loans issuance, term years | 25 |  |
Impaired Financing Receivable, Average Recorded Investment | 21,300,000 | 22,900,000 | 7,400,000
Interest income recognized on mortgage loans subsequent to impairment | 800,000 | 0 | 100,000
Financing Receivable, Recorder Investment, Nonaccrual status | 1 | 0 |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 9,400,000 |  |
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% |  |
Cash Collateral for Borrowed Securities | 312,300,000 | 0 |
Securities Loaned | 319,100,000 |  |
Securities Received as Collateral | 16,700,000 |  |
Outstanding Repurchase Agreements | 0.0 |  |
Nonperforming Financing Receivable [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 90 |  |
Partnership Interests In Tax Credit Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Carrying amount of variable interest entity investments | 329,900,000 |  |
Equity Method Investments |  |  |
Schedule of Investments [Line Items] |  |  |
Carrying amount of variable interest entity investments | 98,400,000 |  |
Bonds |  |  |
Schedule of Investments [Line Items] |  |  |
Fair value of fixed maturity securities | 121,300,000 |  |
Nonredeemable Preferred Stock |  |  |
Schedule of Investments [Line Items] |  |  |
Other Long-term Investments | 100,000 |  |
Partnership Interest |  |  |
Schedule of Investments [Line Items] |  |  |
Other Long-term Investments | 8,000,000 |  |
External Credit Rating, Investment Grade |  |  |
Schedule of Investments [Line Items] |  |  |
Fair value of fixed maturity securities | 39,675,800,000 |  |
Fair value of fixed maturity securities, gross unrealized gain | 5,951,600,000 |  |
Fair Value of fixed maturity securities, gross unrealized loss | 140,300,000 |  |
Fixed maturity securities in unrealized loss position, percent of total | 63.10% |  |
Number of fixed maturity securities that were in an unrealized loss position | 92 |  |
Number of fixed maturity securities in an unrealized loss position continuously for over one year | 42 |  |
External Credit Rating, Non Investment Grade |  |  |
Schedule of Investments [Line Items] |  |  |
Fair value of fixed maturity securities | 2,810,900,000 |  |
Fair value of fixed maturity securities, gross unrealized gain | 116,600,000 |  |
Fair Value of fixed maturity securities, gross unrealized loss | $ 81,900,000 |  |
Fixed maturity securities in unrealized loss position, percent of total | 36.90% |  |
Number of fixed maturity securities that were in an unrealized loss position | 55 |  |
Number of fixed maturity securities in an unrealized loss position continuously for over one year | 22 |  |

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- Definition The carrying value as of the balance sheet date of securities loaned to other broker dealers, typically used by such parties to cover short sales, secured by cash or other securities furnished by such parties until the borrowing is closed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 405 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6476329&loc=d3e44140-110984 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6862952&loc=SL6224234-111729 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph a -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 AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Chapter 4 -Paragraph 32 -IssueDate 2006-05-01 -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 91, 93 -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. + Details
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