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Stock-Based Compensation - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted 147,660 149,720 173,553  
Restricted stock units outstanding 57,145 53,272 42,938  
Unvested restricted shares outstanding 471,330 391,700 327,000 237,150
Equity awards, settled in cash $ 0 $ 0 $ 0  
Minimum [Member] | Torchmark Corporation 2011 Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option contractual term 7 years      
Vesting period 3 years      
Maximum [Member] | Torchmark Corporation 2011 Incentive Plan [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option contractual term 10 years      
Vesting period 5 years      
Equity Option [Member] | Torchmark Corporation 2011 Incentive Plan [Member] | Director [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 6 months      
Equity Option [Member] | Torchmark Corporation 2011 Incentive Plan [Member] | Employees [Member] | Seven Year Grants [Member] | One-Half [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 2 years      
Equity Option [Member] | Torchmark Corporation 2011 Incentive Plan [Member] | Employees [Member] | Seven Year Grants [Member] | One-Half [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Equity Option [Member] | Torchmark Corporation 2011 Incentive Plan [Member] | Employees [Member] | Ten Year Grants [Member] | One-Fourth [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 2 years      
Equity Option [Member] | Torchmark Corporation 2011 Incentive Plan [Member] | Employees [Member] | Ten Year Grants [Member] | One-Fourth [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Equity Option [Member] | Torchmark Corporation 2011 Incentive Plan [Member] | Employees [Member] | Ten Year Grants [Member] | One-Fourth [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Equity Option [Member] | Torchmark Corporation 2011 Incentive Plan [Member] | Employees [Member] | Ten Year Grants [Member] | One-Fourth [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 5 years      
Equity Option [Member] | Previous Plan [Member] | Director [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 6 months      
Equity Option [Member] | Previous Plan [Member] | Employees [Member] | One-Half [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 2 years      
Equity Option [Member] | Previous Plan [Member] | Employees [Member] | One-Half [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Equity Option [Member] | Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option contractual term 7 years      
Equity Option [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Option contractual term 10 years      
Performance Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted 99,000 80,000    
Shares grant price $ 56.10      
Shares aggregate grant price 5,500,000 3,900,000    
Contractual period 3 years 3 years    
Performance Shares [Member] | Minimum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares grant price   $ 48.72    
Performance shares target distribution 0 0    
Performance Shares [Member] | Maximum [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares grant price   $ 49.09    
Performance shares target distribution 197,000 160,000    
Directors Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted 10,030 9,720 6,303  
Shares grant price $ 53.18 $ 43.74 $ 40.45  
Shares aggregate grant price $ 533,000 $ 425,000 $ 255,000  
Unvested restricted shares outstanding 0 0 0 0