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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue |  |
Revenue | $ 700,131 | $ 538,473
Percentage of revenue from contract with customer (as a percent) | 100.00% | 100.00%
Industrial |  |
Disaggregation of Revenue |  |
Revenue | $ 275,198 | $ 168,660
Percentage of revenue from contract with customer (as a percent) | 39.30% | 31.30%
Education |  |
Disaggregation of Revenue |  |
Revenue | $ 109,584 | $ 66,743
Percentage of revenue from contract with customer (as a percent) | 15.70% | 12.40%
Office Buildings |  |
Disaggregation of Revenue |  |
Revenue | $ 75,572 | $ 66,212
Percentage of revenue from contract with customer (as a percent) | 10.80% | 12.30%
Healthcare |  |
Disaggregation of Revenue |  |
Revenue | $ 99,259 | $ 92,023
Percentage of revenue from contract with customer (as a percent) | 14.20% | 17.10%
Government |  |
Disaggregation of Revenue |  |
Revenue | $ 38,981 | $ 32,279
Percentage of revenue from contract with customer (as a percent) | 5.60% | 6.00%
Retail, Restaurants and Entertainment |  |
Disaggregation of Revenue |  |
Revenue | $ 61,203 | $ 59,391
Percentage of revenue from contract with customer (as a percent) | 8.70% | 11.00%
Multi-Family and Residential |  |
Disaggregation of Revenue |  |
Revenue | $ 18,731 | $ 30,235
Percentage of revenue from contract with customer (as a percent) | 2.70% | 5.60%
Other |  |
Disaggregation of Revenue |  |
Revenue | $ 21,603 | $ 22,930
Percentage of revenue from contract with customer (as a percent) | 3.00% | 4.30%
New Construction |  |
Disaggregation of Revenue |  |
Revenue | $ 347,400 | $ 223,960
Percentage of revenue from contract with customer (as a percent) | 49.60% | 41.60%
Existing Building Construction |  |
Disaggregation of Revenue |  |
Revenue | $ 207,166 | $ 182,296
Percentage of revenue from contract with customer (as a percent) | 29.60% | 33.80%
Service Projects |  |
Disaggregation of Revenue |  |
Revenue | $ 51,648 | $ 50,384
Percentage of revenue from contract with customer (as a percent) | 7.40% | 9.40%
Service Calls, Maintenance and Monitoring |  |
Disaggregation of Revenue |  |
Revenue | $ 93,917 | $ 81,833
Percentage of revenue from contract with customer (as a percent) | 13.40% | 15.20%
Mechanical Services |  |
Disaggregation of Revenue |  |
Revenue | $ 565,464 | $ 534,585
Percentage of revenue from contract with customer (as a percent) | 80.80% | 99.30%
Electrical Services |  |
Disaggregation of Revenue |  |
Revenue | $ 134,667 | $ 3,888
Percentage of revenue from contract with customer (as a percent) | 19.20% | 0.70%

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