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SENTAL Acquisition - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 23, 2018
Mar. 29, 2019
Mar. 30, 2018
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]        
Preliminary purchase price, net of cash acquired   $ 0 $ 37,210  
Goodwill   233,619   $ 233,619
SENTEL        
Acquired Finite-Lived Intangible Assets [Line Items]        
Percentage of outstanding common stock acquired 100.00%      
Preliminary purchase price, net of cash acquired $ 36,855      
Consideration transferred 36,000      
Working capital adjustments 900      
Goodwill 16,689      
Recognized revenue from acquired entity   $ 34,900 $ 23,100  
SENTEL | Backlog        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets $ 6,500      
Amortization period 4 years      
SENTEL | Re-competes        
Acquired Finite-Lived Intangible Assets [Line Items]        
Intangible assets $ 4,000      
Amortization period 8 years