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Leases - Additional Information (Details)
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
lease
Jun. 30, 2020
USD ($)
Sep. 30, 2020
Dec. 31, 2020
USD ($)
Lessee, Lease, Description [Line Items]            
Accounting Standards Update [Extensible List]       us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate202006Member  
Operating lease right-of-use assets $ 47,772,000   $ 47,772,000     $ 47,653,000
Extension options, term of extension     5 years      
Operating lease liabilities 52,177,000   $ 52,177,000     $ 52,030,000
Short-term operating lease liability 12,700,000   12,700,000      
Long-term operating lease liability 39,500,000   $ 39,500,000      
Number of leases extended | lease     9      
Number of new leases | lease     0      
Rent expense $ 4,500,000 $ 4,500,000 $ 9,000,000.0 $ 9,100,000    
Minimum            
Lessee, Lease, Description [Line Items]            
Remaining lease term for operating leases 1 year   1 year      
Extension options, term of extension     3 years      
Maximum            
Lessee, Lease, Description [Line Items]            
Remaining lease term for operating leases 10 years   10 years      
Extension options, term of extension     5 years