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Lease Commitments - Additional Information (Details) - USD ($)
 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]        
Operating lease ROU asset $ 107,956,000   $ 102,354,000 [1] $ 122,300,000
Lease liability $ 123,881,000   $ 117,829,000  
Renewal term 5 years      
Termination period 1 year      
Sublease income, remainder of 2020 $ 1,100,000      
Sublease income, 2021 4,200,000      
Sublease income, 2022 100,000      
Leases, not yet commenced $ 2,395,000      
Minimum        
Lessee, Lease, Description [Line Items]        
Remaining lease term 1 year      
Lease term, not yet commenced 5 years      
Maximum        
Lessee, Lease, Description [Line Items]        
Remaining lease term 11 years      
Lease term, not yet commenced 10 years      
Allen, TX        
Lessee, Lease, Description [Line Items]        
Operating lease ROU asset   $ 11,455,000    
Lease liability   $ 11,455,000    
[1] Derived from the audited Consolidated Balance Sheet