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Revenue from Contracts with Customers (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Business Acquisition [Line Items]          
Performance obligation satisfied in previous period $ 0 $ 0 $ 0 $ 0  
Change in estimate of transaction price 0 0 0 0  
Change in total estimated cost 0 0 0 0  
Loss on contracts 0 $ 0 0 $ 0  
Change in net contract liabilities     29,100,000    
Contract asset impairment     0   $ 0
Remaining performance obligations $ 4,225,995,000   4,225,995,000    
2019 Acquisitions          
Business Acquisition [Line Items]          
Increase in contract assets from acquisitions     5,800,000    
Increase in contract liabilities from acquisitions     $ 10,500,000