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Investments - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Investments |  |  |
Fixed Maturity Securities Other Than Temporary Impairments in Accumulated Other Comprehensive Income Loss | $ 0 |  | $ 0
Commitment to Fund Private Placement Fixed Maturity Securities | 213,500,000 |  |
Carrying Amount of Variable Interest Entity Investments | 532,400,000 |  | $ 535,400,000
Unfunded Commitments to Investment Partnerships | 3,700,000 |  |
Fair Value of Fixed Maturity Securities | $ 44,500,100,000 |  |
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 |  |
Number of Financing Receivables on Nonaccrual Status | 1 |  | 0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing | $ 3,200,000 |  |
Number of Changes to Accounting Policy for Estimating Credit Losses on Mortgage Loans | 0 |  |
Impaired Financing Receivable, Average Recorded Investment | $ 1,100,000 | $ 0 |
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method | 0 | 0 |
Committments to Fund Commercial Mortgage Loans | $ 78,900,000 |  |
Repurchase agreements - Typical Days Outstanding | 30 days |  |
Minimum Percent of Fair Value of Securities Loaned or Securities Purchased Under Repurchase Agreements to be Maintained as Collateral | 102.00% |  |
Net Securities Borrowed Reported in Balance Sheet | $ 104,200,000 |  | $ 159,200,000
Outstanding Repurchase Agreements | 0 |  | 0
Off Balance Sheet Amount |  |  |
Schedule of Investments |  |  |
Cash Collateral for Borrowed Securities | 16,000,000 |  | 30,500,000
Securities Received as Collateral | 94,300,000 |  | 135,600,000
Commercial Real Estate Portfolio Segment |  |  |
Schedule of Investments |  |  |
Financing Receivable, Allowance for Credit Losses | 0 |  | 0
Provision for Loan and Lease Losses | $ 0 | $ 0 |
Commercial Real Estate Portfolio Segment |  |  |
Schedule of Investments |  |  |
Number of Loan Modifications due to Loan Foreclosure | 0 | 0 |
Special Purpose Entity | Bonds |  |  |
Schedule of Investments |  |  |
Fair Value of Fixed Maturity Securities | $ 154,400,000 |  | 154,100,000
Partnership Interests In Tax Credit Investments |  |  |
Schedule of Investments |  |  |
Carrying Amount of Variable Interest Entity Investments | 119,100,000 |  | 128,200,000
Equity Method Investments |  |  |
Schedule of Investments |  |  |
Carrying Amount of Variable Interest Entity Investments | $ 413,300,000 |  | $ 407,200,000
External Credit Rating, Investment Grade |  |  |
Schedule of Investments |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position | 413 |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One year | 141 |  |
Fair Value of Fixed Maturity Securities | $ 41,233,800,000 |  |
External Credit Rating, Non Investment Grade |  |  |
Schedule of Investments |  |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position | 88 |  |
Number of Fixed Maturity Securities in an Unrealized Loss Position Continuously for Over One year | 20 |  |
Fair Value of Fixed Maturity Securities | $ 3,266,300,000 |  |

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