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Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 25, 2020
May 30, 2019
May 16, 2014
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 23, 2020
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award                      
Performance period             3 years        
Stock based compensation costs             $ 64,466 $ 40,722 $ 35,051    
Tax benefit from compensation expense             9,300 5,800 5,700    
Tax benefits (loss) realized from option exercises             3,700 8,400 4,600    
Award Incentive Bonus                      
Share-based Compensation Arrangement by Share-based Payment Award                      
Stock based compensation costs             $ 5,700 $ 6,700 $ 6,700    
Vested shares issued (in shares)         44,788 58,783          
Weighted-average grant date fair value (in dollars per share)         $ 150.03 $ 113.55          
Award Incentive Bonus | Subsequent Event                      
Share-based Compensation Arrangement by Share-based Payment Award                      
Vested shares issued (in shares)       58,058              
Weighted-average grant date fair value (in dollars per share)       $ 108.03              
WRL Omnibus Plan                      
Share-based Compensation Arrangement by Share-based Payment Award                      
Term of plan     10 years                
Shares authorized for issuance 5,909,390   4,409,390                
Increase in shares authorized for issuance (in shares) 1,500,000                    
Aggregate amount of common stock available for grant             3,495,890        
Stock options granted (in shares)             0 0 0    
Unvested awards compensation not yet recognized             $ 63,400        
Unvested awards compensation costs period of recognition             1 year 7 months 28 days        
Vested shares issued (in shares)             841,226        
Weighted-average grant date fair value (in dollars per share)             $ 99.21 $ 119.61 $ 170.13    
WML Share Option Plan                      
Share-based Compensation Arrangement by Share-based Payment Award                      
Term of plan   10 years                  
Shares authorized for issuance   519,695,860                  
Aggregate amount of common stock available for grant             510,800,860        
WML Share Award Plan                      
Share-based Compensation Arrangement by Share-based Payment Award                      
Shares authorized for issuance                     75,000,000
Aggregate amount of common stock available for grant             50,290,387        
Unvested awards compensation not yet recognized             $ 14,100        
Unvested awards compensation costs period of recognition             1 year 4 months 6 days        
Vested shares issued (in shares)             6,747,501        
Weighted-average grant date fair value (in dollars per share)             $ 1.86 $ 2.43 $ 3.07    
WIL Omnibus Plan                      
Share-based Compensation Arrangement by Share-based Payment Award                      
Shares authorized for issuance                   101,419  
Aggregate amount of common stock available for grant             20,573