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Customer Lists, Net - Additional Information (Detail) - Customer lists, net
12 Months Ended
Dec. 31, 2020
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Impairment of finite-lived identifiable intangible assets $ 0
Amortization expense for 2021 1,700,000
Amortization expense for 2022 1,700,000
Amortization expense for 2023 1,700,000
Amortization expense for 2024 1,700,000
Amortization expense for 2025 $ 1,700,000
Minimum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life 5 years
Maximum  
Finite-Lived Intangible Assets [Line Items]  
Estimated useful life 12 years