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Leases - Schedule of Lease Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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

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- Definition Operating and Finance Lease Assets, Total + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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