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Goodwill and Other Intangible Assets - Additional Information (Detail)
9 Months Ended
Sep. 30, 2020
USD ($)
Goodwill [Line Items]  
Changes in goodwill $ 0
Customer Related Intangible Assets [Member]  
Goodwill [Line Items]  
Intangible assets, useful life 12 months
Intangible assets, amortization method straight-line basis
Intangible assets, amortization expense $ 229,000