Significant Accounting Policies - Additional Information (Detail) $ in Thousands				3 Months Ended	12 Months Ended
	Jul. 03, 2025 USD ($)	Mar. 31, 2025 USD ($)	Jan. 01, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 01, 2025 USD ($)
Significant of Account Policies [Line Items]
Number of reportable segments | segment					3
Mortgage loans				$ 396,088	$ 428,517	$ 396,088
Capital called from investment funds					251,000
Investment funds, unfunded commitments					$ 558,000
Percentage of remaining security types					1.00%
Percentage of fair value of fixed maturities determined by third party					98.00%
Percentage of agent first year commissions as an advance					65.00%
Agent debit balances				542,000	$ 591,000	542,000
Agent debit balances, allowance for credit losses				1,400	1,400	1,400
Advertising costs charged to earnings and included in other operating					7,100	15,700	$ 19,200
Capitalized advertising costs				1,600,000	1,620,000	1,600,000
Increase in goodwill						8,700
Carrying value of investment in low-income housing interests				270,000	476,000	270,000
Obligations under future commitments for low-income housing interests					255,000
Original cost of property and equipment				527,000	615,000	527,000
Accumulated depreciation				242,000	245,000	242,000
Depreciation expense					30,000	27,000	21,000
Percentage of liabilities ceded			100.00%
Reserves ceded			$ 458,000
Net proceeds from recapture and termination agreement		$ 39,000			39,000	0	0
Underwriting gain recognized from recapture and termination agreement		$ 14,000
Assets transferred to Regulation 114 Trust								$ 1,200,000
Transfer of fixed maturities and accrued investment income in connection with reinsurance transaction				462,000
Coinsurance agreement, ceding commission, before tax				50,000
Amounts paid to reinsurer				$ 413,000	0	$ 413,779	0
Percentage of reserves required to maintain as assets in trust				105.00%		105.00%
Insurance policy charges					$ 11,700	$ 12,300	$ 12,900
Equity Option | Torchmark Corporation 2018 Incentive Plan
Significant of Account Policies [Line Items]
Term over which monthly data points are used to derive volatility					3 years
Equity Option | Torchmark Corporation 2018 Incentive Plan | Employees | Three Year Vesting Period
Significant of Account Policies [Line Items]
Option grants contractual term					7 years
Vesting period					3 years
Equity Option | Torchmark Corporation 2018 Incentive Plan | Employees | Five Year Vesting Period
Significant of Account Policies [Line Items]
Option grants contractual term					10 years
Vesting period					5 years
Equity Option | Torchmark Corporation 2018 Incentive Plan | Directors
Significant of Account Policies [Line Items]
Vesting period					6 months
Real Estate In McKinney, Texas
Significant of Account Policies [Line Items]
Acquisition consideration	$ 80,000
Building | Real Estate In McKinney, Texas
Significant of Account Policies [Line Items]
Property and equipment, estimated useful life	40 years
Low-income housing credits and certain limited partnerships | Total Assets | Investment Type
Significant of Account Policies [Line Items]
Concentration risk percentage					3.00%
Life insurance
Significant of Account Policies [Line Items]
Proportion of future policy reserves which are not universal life type					93.00%
Minimum | Equipment and Software
Significant of Account Policies [Line Items]
Property and equipment, estimated useful life					3 years
Minimum | Building and Improvements
Significant of Account Policies [Line Items]
Property and equipment, estimated useful life					15 years
Maximum | Equipment and Software
Significant of Account Policies [Line Items]
Property and equipment, estimated useful life					15 years
Maximum | Building and Improvements
Significant of Account Policies [Line Items]
Property and equipment, estimated useful life					40 years
Investment in Limited Partnerships
Significant of Account Policies [Line Items]
Capital called from investment funds					$ 251,000
Investment funds, unfunded commitments					557,765
Participating Mortgages
Significant of Account Policies [Line Items]
Accrued interest receivable					$ 2,400
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]					Accrued investment income
Commercial loan participations
Significant of Account Policies [Line Items]
Financing receivable, term					3 years
Financing receivable, extension term					2 years
Unfunded Loan Commitment | Commercial Portfolio Segment
Significant of Account Policies [Line Items]
Mortgage loans					$ 21,000