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Leases - Schedule of Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] eme:CurrentMaturitiesOfLongTermDebtAndFinanceLeaseLiabilities  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] eme:LongTermDebtAndFinanceLeaseLiabilitiesNonCurrent  
Assets    
Operating lease right-of-use assets $ 245,471 $ 0
Finance lease right-of-use assets 9,609  
Total lease assets 255,080  
Current    
Operating lease liabilities, current 53,144 0
Finance lease liabilities, current 4,088  
Noncurrent    
Operating lease liabilities, long-term 204,950 $ 0
Finance lease liabilities, long-term 5,591  
Total lease liabilities $ 267,773