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Debt - Additional Information (Details)
12 Months Ended
Nov. 15, 2017
USD ($)
Dec. 31, 2020
USD ($)
letters_of_credit
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity $ 100,000,000.0      
Accordion feature, increase limit 100,000,000.0      
Deferred debt issuance costs   $ 1,100,000    
Unamortized debt issuance costs   1,600,000 $ 1,000,000.0  
Payments of debt issuance costs   830,000 0 $ 0
Amortization expense   $ 386,000 404,000 $ 426,000
Letters of credit        
Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity 25,000,000.0      
Number of letters of credit outstanding | letters_of_credit   2    
Letters of credit outstanding   $ 2,400,000    
Senior secured credit facilities        
Debt Instrument [Line Items]        
Covenant terms, ratio of total indebtedness to combined EBITDA   3.00    
Covenant terms, maximum debt to EBITDA ratio, 12 months following purchase   3.50    
Covenant terms, ratio of combined EBITDA to combined interest expense   4.50    
Ratio of total indebtedness to combined EBITDA   2.05    
Ratio of combined EBITDA to combined interest expense   19.63    
Interest rate   1.90%    
Senior secured credit facilities | Minimum        
Debt Instrument [Line Items]        
Undrawn portion of revolving facility, commitment fee percentage   0.30%    
Senior secured credit facilities | Maximum        
Debt Instrument [Line Items]        
Undrawn portion of revolving facility, commitment fee percentage   0.45%    
Senior secured credit facilities | London Interbank Offered Rate (LIBOR) | Minimum        
Debt Instrument [Line Items]        
Spread on variable rate   1.75%    
Senior secured credit facilities | London Interbank Offered Rate (LIBOR) | Maximum        
Debt Instrument [Line Items]        
Spread on variable rate   2.50%    
Senior secured credit facilities | Base rate | Minimum        
Debt Instrument [Line Items]        
Spread on variable rate   0.75%    
Senior secured credit facilities | Base rate | Maximum        
Debt Instrument [Line Items]        
Spread on variable rate   1.50%    
Term facility | Line of Credit        
Debt Instrument [Line Items]        
Distribution to subsidiary of Exelis 74,600,000      
Payments of debt issuance costs 1,800,000      
Amortization expense   $ 400,000    
Line of credit   64,000,000.0 70,500,000  
Revolver | Line of Credit        
Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity 270,000,000.0      
Available borrowing capacity   152,600,000    
Unsecured Debt        
Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity $ 75,000,000.0      
Line of credit   115,000,000.0 $ 0  
Amount used for acquisitions   115,000,000.0    
Quarterly Fiscal Quarters December 31, 2020 Through September 30, 2021 | Term facility        
Debt Instrument [Line Items]        
Line of credit   2,000,000.0    
Quarterly December 31, 2021 Through September 30, 2022 | Term facility        
Debt Instrument [Line Items]        
Line of credit   2,600,000    
Due November 15, 2022 | Term facility        
Debt Instrument [Line Items]        
Line of credit   $ 47,600,000