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Operating Information by Segment and Geographic Area - Total Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Assets $ 7,856,477 $ 7,309,812
Reportable segments | Energy Solutions    
Segment Reporting Information [Line Items]    
Assets 1,118,500 1,010,900
Reportable segments | Urban Solutions    
Segment Reporting Information [Line Items]    
Assets 1,204,900 1,122,500
Reportable segments | Mission Solutions    
Segment Reporting Information [Line Items]    
Assets 548,900 575,800
Reportable segments | Other    
Segment Reporting Information [Line Items]    
Assets $ 35,600 $ 37,800