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Revenue from Contracts with Customers (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Business Acquisition [Line Items]      
Performance obligation satisfied in previous period $ 0 $ 0  
Change in estimate of transaction price 0 0  
Change in total estimated cost 0 0  
Loss on contracts 0 $ 0  
Allowance for credit losses 18,063,000   $ 18,031,000
Change in net contract liabilities 3,100,000    
Contract asset impairment 0   $ 0
Remaining performance obligations 4,775,157,000    
2021Acquisitions      
Business Acquisition [Line Items]      
Increase (decrease) in contract assets from acquisitions 900,000    
Increase (decrease) in contract liabilities from acquisitions $ 100,000