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Identifiable Intangible Assets from Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]            
Pre-tax non-cash impairment totaling $ 5,903,000 $ 5,900,000   $ 5,903,000    
Net Carrying Amount 9,408,000 11,800,000   9,408,000   $ 19,485,000
Impairment of intangible assets from acquisitions       5,903,000    
Amortization of intangible assets from acquisitions 1,206,000   $ 1,568,000 4,175,000 $ 4,704,000  
Estimated remaining amortization expense in 2020 1,200,000     1,200,000    
Estimated amortization expense in 2021 3,900,000     3,900,000    
Estimated amortization expense in 2022 1,900,000     1,900,000    
Estimated amortization expense in 2023 1,800,000     1,800,000    
Estimated amortization expense in 2024 600,000     600,000    
Customer Relationships            
Finite Lived Intangible Assets [Line Items]            
Pre-tax non-cash impairment totaling 4,202,000     4,202,000    
Net Carrying Amount 4,526,000     $ 4,526,000   10,234,000
Weighted average useful life       5 years    
Technologies            
Finite Lived Intangible Assets [Line Items]            
Pre-tax non-cash impairment totaling 1,062,000     $ 1,062,000    
Net Carrying Amount 4,181,000     $ 4,181,000   7,117,000
Weighted average useful life       3 years    
Tradenames            
Finite Lived Intangible Assets [Line Items]            
Pre-tax non-cash impairment totaling 181,000     $ 181,000    
Net Carrying Amount 35,000     $ 35,000   353,000
Weighted average useful life       2 years    
Non-compete Agreements            
Finite Lived Intangible Assets [Line Items]            
Pre-tax non-cash impairment totaling 458,000     $ 458,000    
Net Carrying Amount $ 666,000     $ 666,000   $ 1,781,000
Non-compete Agreements | Minimum            
Finite Lived Intangible Assets [Line Items]            
Weighted average useful life       1 year    
Non-compete Agreements | Maximum            
Finite Lived Intangible Assets [Line Items]            
Weighted average useful life       2 years    
Other Operating Expense            
Finite Lived Intangible Assets [Line Items]            
Impairment of intangible assets from acquisitions   $ 5,900,000