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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of Revenue |  |  |  |
Revenue | $ 743,468 | $ 650,302 | $ 1,443,599 | $ 1,188,775
Percentage of revenue from contract with customer (as a percent) | 100.00% | 100.00% | 100.00% | 100.00%
Industrial |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 300,870 | $ 198,002 | $ 576,068 | $ 366,662
Percentage of revenue from contract with customer (as a percent) | 40.50% | 30.50% | 39.90% | 30.80%
Education |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 130,004 | $ 100,220 | $ 239,588 | $ 166,963
Percentage of revenue from contract with customer (as a percent) | 17.50% | 15.40% | 16.60% | 14.10%
Office Buildings |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 75,594 | $ 105,483 | $ 151,166 | $ 171,695
Percentage of revenue from contract with customer (as a percent) | 10.20% | 16.20% | 10.50% | 14.40%
Healthcare |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 96,050 | $ 87,878 | $ 195,309 | $ 179,901
Percentage of revenue from contract with customer (as a percent) | 12.90% | 13.50% | 13.50% | 15.10%
Government |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 39,832 | $ 44,443 | $ 78,813 | $ 76,722
Percentage of revenue from contract with customer (as a percent) | 5.40% | 6.80% | 5.50% | 6.50%
Retail, Restaurants and Entertainment |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 64,628 | $ 58,086 | $ 125,831 | $ 117,477
Percentage of revenue from contract with customer (as a percent) | 8.70% | 8.90% | 8.70% | 9.90%
Multi-Family and Residential |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 20,555 | $ 29,061 | $ 39,286 | $ 59,296
Percentage of revenue from contract with customer (as a percent) | 2.80% | 4.50% | 2.70% | 5.00%
Other |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 15,935 | $ 27,129 | $ 37,538 | $ 50,059
Percentage of revenue from contract with customer (as a percent) | 2.00% | 4.20% | 2.60% | 4.20%
New Construction |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 377,433 | $ 291,479 | $ 724,833 | $ 515,439
Percentage of revenue from contract with customer (as a percent) | 50.80% | 44.80% | 50.20% | 43.40%
Existing Building Construction |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 225,103 | $ 199,398 | $ 432,269 | $ 381,694
Percentage of revenue from contract with customer (as a percent) | 30.30% | 30.70% | 29.90% | 32.10%
Service Projects |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 58,378 | $ 58,808 | $ 110,026 | $ 109,192
Percentage of revenue from contract with customer (as a percent) | 7.80% | 9.00% | 7.60% | 9.20%
Service Calls, Maintenance and Monitoring |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 82,554 | $ 100,617 | $ 176,471 | $ 182,450
Percentage of revenue from contract with customer (as a percent) | 11.10% | 15.50% | 12.30% | 15.30%
Mechanical Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 622,700 | $ 553,031 | $ 1,188,164 | $ 1,087,616
Percentage of revenue from contract with customer (as a percent) | 83.80% | 85.00% | 82.30% | 91.50%
Electrical Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 120,768 | $ 97,271 | $ 255,435 | $ 101,159
Percentage of revenue from contract with customer (as a percent) | 16.20% | 15.00% | 17.70% | 8.50%

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