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Leases - Future Minimum Rental Payments For Operating Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Leases [Abstract]    
2020 $ 1,144  
2021 4,566  
2022 4,230  
2023 3,554  
2024 3,278  
Thereafter 17,457  
Total 34,229  
Discount for present value of expected cash flows (5,335)  
Lease liability at September 30, 2020 $ 28,894 $ 27,540