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Lease Obligations - Additional information (Details)
9 Months Ended
Sep. 30, 2021
USD ($)
Operating And Finance Leases [Line Items]  
Option to extend lease term (up to) 5 years
Option to terminate leases, period 1 year
Outstanding finance lease obligations $ 0
Minimum lease payments required 25,544,000
Subsidiaries | Employees  
Operating And Finance Leases [Line Items]  
Minimum lease payments required $ 2,500,000
Lease amortization period 2 years 9 months 18 days
Minimum  
Operating And Finance Leases [Line Items]  
Remaining lease term 1 year
Maximum  
Operating And Finance Leases [Line Items]  
Remaining lease term 6 years