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Leases - Schedule of Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
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 $ 242,155 $ 245,471
Finance lease right-of-use assets 9,638 9,609
Total lease assets 251,793 255,080
Current    
Operating lease liabilities, current 53,632 53,144
Finance lease liabilities, current 3,995 4,088
Noncurrent    
Operating lease liabilities, long-term 205,362 204,950
Finance lease liabilities, long-term 5,971 5,591
Total lease liabilities $ 268,960 $ 267,773