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Lease Commitments - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Leases [Abstract]        
Consolidated rent expense       $ 40,500,000
Right-of-use assets obtained in exchange for new operating leases after adoption of ASC 842   $ 24,400,000 $ 26,100,000  
Weighted average remaining lease term - operating leases 8 years 7 years 8 years  
Weighted average discount rate - operating leases 4.00% 4.00% 4.00%  
Expense recorded to reduce carrying value of right-of-use assets to fair value $ 8,100,000 $ 0    
Level 3 | Discounted Cash Flow | Price per square foot | Minimum        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 13      
Level 3 | Discounted Cash Flow | Price per square foot | Maximum        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 68      
Level 3 | Discounted Cash Flow | Price per square foot | Weighted Average        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 46      
Level 3 | Discounted Cash Flow | Discount rate | Minimum        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 0.033      
Level 3 | Discounted Cash Flow | Discount rate | Maximum        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 0.055      
Level 3 | Discounted Cash Flow | Tax rate        
Lessee, Lease, Description [Line Items]        
Right-of-use assets, measurement input 0.25