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Business Combinations - Additional Information (Detail)
€ in Millions
12 Months Ended
Apr. 01, 2019
USD ($)
Feb. 28, 2019
USD ($)
Feb. 28, 2019
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]            
Payments of business, net of cash acquired       $ 0 $ 18,894,000 $ 0
Goodwill       29,508,000 27,840,000 $ 15,621,000
Intangibles - net       14,443,000 15,116,000  
SubCon [Member]            
Business Acquisition [Line Items]            
Business acquisition, percentage of voting interests acquired   100.00%        
Total purchase price   $ 10,100,000        
Payments of business, net of cash acquired   1,900,000        
Goodwill   6,600,000        
Intangibles - net   4,700,000        
Purchase price estimated contingent liability   $ 600,000   0    
Potential maximum payment | €     € 4.0      
SubCon [Member] | Other Noncurrent Liabilities [Member]            
Business Acquisition [Line Items]            
Business combination earn-out liability       $ 0.0 $ 600,000  
MICOS Telecom [Member]            
Business Acquisition [Line Items]            
Business acquisition, percentage of voting interests acquired 90.00%          
Total purchase price $ 8,800,000          
Payments of business, net of cash acquired 500,000          
Goodwill 5,600,000          
Intangibles - net $ 3,400,000          
Useful lives 12 years          
Business acquisition, percentage of remaining voting interests to be acquired 10.00%          
Business acquisition, maximum period, remaining voting interests to be acquired 3 years          
Percentage of remaining voting interests deferred consideration payable 10.00%          
MICOS Telecom [Member] | Other Noncurrent Liabilities [Member]            
Business Acquisition [Line Items]            
Business combination hold-back liability $ 1,500,000          
Business combination hold-back liability payable term 2 years          
Business combination deferred consideration $ 900,000          
Maximum [Member]            
Business Acquisition [Line Items]            
Useful lives       20 years    
Maximum [Member] | SubCon [Member]            
Business Acquisition [Line Items]            
Useful lives   11 years 11 years      
Minimum [Member]            
Business Acquisition [Line Items]            
Useful lives       1 year    
Minimum [Member] | SubCon [Member]            
Business Acquisition [Line Items]            
Useful lives   10 years 10 years