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Leases - Schedule of Lease Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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 | $ 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 |

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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=77888419&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=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under 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=77888419&loc=SL77918627-209977 + Details
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