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Leases - Lessee - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Lessee Lease Description [Line Items]    
Right-of-use lease assets $ 9,387 $ 10,331
Operating lease liabilities $ 11,489  
Weighted-average discount rate 4.75%  
Weighted-average remaining lease term 4 years  
Other Liabilities    
Lessee Lease Description [Line Items]    
Operating lease liabilities $ 11,489 $ 12,636