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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue |  |
Revenue | $ 669,761 | $ 700,131
Percentage of revenue from contract with customer (as a percent) | 100.00% | 100.00%
Industrial |  |
Disaggregation of Revenue |  |
Revenue | $ 269,583 | $ 275,198
Percentage of revenue from contract with customer (as a percent) | 40.30% | 39.30%
Education |  |
Disaggregation of Revenue |  |
Revenue | $ 92,457 | $ 109,584
Percentage of revenue from contract with customer (as a percent) | 13.80% | 15.70%
Office Buildings |  |
Disaggregation of Revenue |  |
Revenue | $ 78,996 | $ 75,572
Percentage of revenue from contract with customer (as a percent) | 11.80% | 10.80%
Healthcare |  |
Disaggregation of Revenue |  |
Revenue | $ 95,091 | $ 99,259
Percentage of revenue from contract with customer (as a percent) | 14.20% | 14.20%
Government |  |
Disaggregation of Revenue |  |
Revenue | $ 43,165 | $ 38,981
Percentage of revenue from contract with customer (as a percent) | 6.40% | 5.60%
Retail, Restaurants and Entertainment |  |
Disaggregation of Revenue |  |
Revenue | $ 44,576 | $ 61,203
Percentage of revenue from contract with customer (as a percent) | 6.70% | 8.70%
Multi-Family and Residential |  |
Disaggregation of Revenue |  |
Revenue | $ 24,660 | $ 18,731
Percentage of revenue from contract with customer (as a percent) | 3.70% | 2.70%
Other |  |
Disaggregation of Revenue |  |
Revenue | $ 21,233 | $ 21,603
Percentage of revenue from contract with customer (as a percent) | 3.10% | 3.00%
New Construction |  |
Disaggregation of Revenue |  |
Revenue | $ 302,061 | $ 347,400
Percentage of revenue from contract with customer (as a percent) | 45.10% | 49.60%
Existing Building Construction |  |
Disaggregation of Revenue |  |
Revenue | $ 216,601 | $ 207,166
Percentage of revenue from contract with customer (as a percent) | 32.30% | 29.60%
Service Projects |  |
Disaggregation of Revenue |  |
Revenue | $ 60,060 | $ 51,648
Percentage of revenue from contract with customer (as a percent) | 9.00% | 7.40%
Service Calls, Maintenance and Monitoring |  |
Disaggregation of Revenue |  |
Revenue | $ 91,039 | $ 93,917
Percentage of revenue from contract with customer (as a percent) | 13.60% | 13.40%
Mechanical Services |  |
Disaggregation of Revenue |  |
Revenue | $ 565,620 | $ 570,751
Percentage of revenue from contract with customer (as a percent) | 84.50% | 81.50%
Electrical Services |  |
Disaggregation of Revenue |  |
Revenue | $ 104,141 | $ 129,380
Percentage of revenue from contract with customer (as a percent) | 15.50% | 18.50%

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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