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Business Segments - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Segment Reporting Disclosure [Line Items]  
Litigation settlement amount $ 2,493,000us-gaap_LitigationSettlementExpense
Settled Litigation Regarding Investments [Member]  
Segment Reporting Disclosure [Line Items]  
Litigation settlement amount 1,200,000us-gaap_LitigationSettlementAmount
/ us-gaap_LitigationStatusAxis
= tmk_SettledLitigationRegardingInvestmentsMember
Litigation settlement expense, after tax 752,000tmk_LitigationSettlementExpenseAfterTax
/ us-gaap_LitigationStatusAxis
= tmk_SettledLitigationRegardingInvestmentsMember
Settled Litigation Regarding Non-Insurance Matter [Member]  
Segment Reporting Disclosure [Line Items]  
Litigation settlement amount 3,700,000us-gaap_LitigationSettlementExpense
/ us-gaap_LitigationStatusAxis
= tmk_SettledLitigationRegardingNonInsuranceMatterMember
Prior Year Litigation Matter [Member]  
Segment Reporting Disclosure [Line Items]  
Litigation settlement expense, after tax $ 2,400,000tmk_LitigationSettlementExpenseAfterTax
/ us-gaap_LitigationStatusAxis
= tmk_PriorYearLitigationMatterMember