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Plateau Acquisition - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 02, 2019
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 191,892 $ 85,231
Backlog   1,068,025 $ 850,725
Plateau      
Business Acquisition [Line Items]      
Total consideration $ 427,659    
Goodwill 106,661    
Backlog $ 159,000    
Revenue of acquiree since acquisition date, actual   84,637  
Earnings of acquiree since acquisition date, actual   $ 10,921