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Business Segments - Analysis of Profitability by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Pretax operating income $ 198,797us-gaap_OperatingIncomeLoss $ 203,688us-gaap_OperatingIncomeLoss
Applicable taxes (65,211)tmk_IncomeTaxExpenseBenefitApplicableToSegmentProfitability (66,835)tmk_IncomeTaxExpenseBenefitApplicableToSegmentProfitability
Net operating income 133,586tmk_SegmentReportingProfitAfterTax 136,853tmk_SegmentReportingProfitAfterTax
Realized gains (losses)-Investments 77tmk_SegmentReportingReconcilingItemsRealizedGainsLossesOnInvestmentsNetOfTax 10,802tmk_SegmentReportingReconcilingItemsRealizedGainsLossesOnInvestmentsNetOfTax
Part D adjustment (12,015)tmk_NetAdjustmentToMedicarePartDInterimSegmentResultsAfterTax (13,179)tmk_NetAdjustmentToMedicarePartDInterimSegmentResultsAfterTax
Legal settlement expense 0tmk_SegmentReportingReconcilingItemsNetProceedsOrCostFromLegalSettlementsAfterTax (1,620)tmk_SegmentReportingReconcilingItemsNetProceedsOrCostFromLegalSettlementsAfterTax
Net income 121,648us-gaap_NetIncomeLoss 132,856us-gaap_NetIncomeLoss [1]
Pretax operating income, Change (4,891)tmk_SegmentReportingSegmentProfitIncreaseDecrease  
Applicable taxes, Increase (Decrease) 1,624tmk_SegmentReportingApplicableTaxesIncreaseDecrease  
Net operating income, Increase (Decrease) (3,267)tmk_SegmentReportingProfitAfterTaxAndDiscontinuedOperationsIncreaseDecrease  
Realized gains (losses) - Investments net of tax, Increase (Decrease) (10,725)tmk_SegmentReportingReconcilingItemsRealizedGainsLossesOnInvestmentsNetOfTaxIncreaseDecrease  
Part D adjustment net of tax, Increase (Decrease) 1,164tmk_PartDAdjustmentNetOfTaxIncreaseDecrease  
Legal settlement expenses net of tax, Increase (Decrease) 1,620tmk_SegmentReportingReconcilingItemsNetProceedsOrCostFromLegalSettlementsNetOfTaxIncreaseDecrease  
Net income, Increase (Decrease) (11,208)tmk_NetIncomeLossIncreaseDecrease  
Pretax operating income, Increase (Decrease) % (2.00%)tmk_SegmentReportingSegmentProfitabilityIncreaseDecreasePercentage  
Applicable taxes, Change % (2.00%)tmk_SegmentReportingApplicableTaxesIncreaseDecreasePercentage  
Net operating income, Change % (2.00%)tmk_SegmentReportingProfitAfterTaxAndDiscontinuedOperationsPercentage  
Net income, Change % (8.00%)tmk_NetIncomeLossIncreaseDecreasePercentage  
Medicare Part D [Member]    
Segment Reporting Information [Line Items]    
Part D adjustment (12,015)tmk_NetAdjustmentToMedicarePartDInterimSegmentResultsAfterTax
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_MedicarePartDMember		 (13,179)tmk_NetAdjustmentToMedicarePartDInterimSegmentResultsAfterTax
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_MedicarePartDMember
Operating Segments [Member] | Life Insurance [Member]    
Segment Reporting Information [Line Items]    
Pretax operating income 141,403us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_LifeSegmentMember		 140,619us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_LifeSegmentMember
Pretax operating income, Change 784tmk_SegmentReportingSegmentProfitIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_LifeSegmentMember		  
Pretax operating income, Increase (Decrease) % 1.00%tmk_SegmentReportingSegmentProfitabilityIncreaseDecreasePercentage
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_LifeSegmentMember		  
Operating Segments [Member] | Health Insurance [Member]    
Segment Reporting Information [Line Items]    
Pretax operating income 51,577us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_HealthSegmentMember		 49,457us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_HealthSegmentMember
Pretax operating income, Change 2,120tmk_SegmentReportingSegmentProfitIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_HealthSegmentMember		  
Pretax operating income, Increase (Decrease) % 4.00%tmk_SegmentReportingSegmentProfitabilityIncreaseDecreasePercentage
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_HealthSegmentMember		  
Operating Segments [Member] | Medicare Part D [Member]    
Segment Reporting Information [Line Items]    
Pretax operating income 5,474us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_MedicarePartDMember		 9,566us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_MedicarePartDMember
Pretax operating income, Change (4,092)tmk_SegmentReportingSegmentProfitIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_MedicarePartDMember		  
Pretax operating income, Increase (Decrease) % (43.00%)tmk_SegmentReportingSegmentProfitabilityIncreaseDecreasePercentage
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_MedicarePartDMember		  
Operating Segments [Member] | Annuity [Member]    
Segment Reporting Information [Line Items]    
Pretax operating income 1,093us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_AnnuitySegmentMember		 1,045us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_AnnuitySegmentMember
Pretax operating income, Change 48tmk_SegmentReportingSegmentProfitIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_AnnuitySegmentMember		  
Pretax operating income, Increase (Decrease) % 5.00%tmk_SegmentReportingSegmentProfitabilityIncreaseDecreasePercentage
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_AnnuitySegmentMember		  
Operating Segments [Member] | Investment [Member]    
Segment Reporting Information [Line Items]    
Pretax operating income 55,140us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_InvestmentSegmentMember		 56,920us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_InvestmentSegmentMember
Pretax operating income, Change (1,780)tmk_SegmentReportingSegmentProfitIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_InvestmentSegmentMember		  
Pretax operating income, Increase (Decrease) % (3.00%)tmk_SegmentReportingSegmentProfitabilityIncreaseDecreasePercentage
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= tmk_InvestmentSegmentMember		  
Operating Segments [Member] | Other and Corporate [Member]    
Segment Reporting Information [Line Items]    
Pretax operating income (55,890)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 (53,919)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Operating Segments [Member] | Other and Corporate [Member] | Other Income [Member]    
Segment Reporting Information [Line Items]    
Pretax operating income 722us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 544us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Pretax operating income, Change 178tmk_SegmentReportingSegmentProfitIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		  
Pretax operating income, Increase (Decrease) % 33.00%tmk_SegmentReportingSegmentProfitabilityIncreaseDecreasePercentage
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		  
Operating Segments [Member] | Other and Corporate [Member] | Administrative Expense [Member]    
Segment Reporting Information [Line Items]    
Pretax operating income (47,200)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 (44,211)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Pretax operating income, Change (2,989)tmk_SegmentReportingSegmentProfitIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		  
Pretax operating income, Increase (Decrease) % 7.00%tmk_SegmentReportingSegmentProfitabilityIncreaseDecreasePercentage
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		  
Operating Segments [Member] | Other and Corporate [Member] | Corporate [Member]    
Segment Reporting Information [Line Items]    
Pretax operating income (9,412)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= tmk_CorporateAndAdjustmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		 (10,252)us-gaap_OperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= tmk_CorporateAndAdjustmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember
Pretax operating income, Change $ 840tmk_SegmentReportingSegmentProfitIncreaseDecrease
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= tmk_CorporateAndAdjustmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		  
Pretax operating income, Increase (Decrease) % (8.00%)tmk_SegmentReportingSegmentProfitabilityIncreaseDecreasePercentage
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_IncomeStatementLocationAxis
= tmk_CorporateAndAdjustmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateAndOtherMember		  
[1] Certain balances were retrospectively adjusted to give effect to the adoption of new accounting guidance as described in Note G- Adoption of New Accounting Standards