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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue |  |  |
Revenue | $ 2,615,277 | $ 2,182,879 |
Percentage of revenue from contract with customer (as a percent) | 100.00% | 100.00% |
Industrial |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 886,668 | $ 596,557 |
Percentage of revenue from contract with customer (as a percent) | 33.90% | 27.30% |
Education |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 412,318 | $ 391,937 |
Percentage of revenue from contract with customer (as a percent) | 15.80% | 18.00% |
Office Buildings |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 348,640 | $ 288,090 |
Percentage of revenue from contract with customer (as a percent) | 13.30% | 13.20% |
Healthcare |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 358,155 | $ 319,958 |
Percentage of revenue from contract with customer (as a percent) | 13.70% | 14.70% |
Government |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 162,507 | $ 143,958 |
Percentage of revenue from contract with customer (as a percent) | 6.20% | 6.60% |
Retail, Restaurants and Entertainment |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 248,083 | $ 225,348 |
Percentage of revenue from contract with customer (as a percent) | 9.50% | 10.30% |
Multi-Family and Residential |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 104,693 | $ 136,075 |
Percentage of revenue from contract with customer (as a percent) | 4.00% | 6.20% |
Other |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 94,213 | $ 80,956 |
Percentage of revenue from contract with customer (as a percent) | 3.60% | 3.70% |
New Construction |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 1,201,122 | $ 829,978 |
Percentage of revenue from contract with customer (as a percent) | 45.90% | 38.00% |
Existing Building Construction |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 793,159 | $ 796,946 |
Percentage of revenue from contract with customer (as a percent) | 30.30% | 36.50% |
Service Projects |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 231,228 | $ 206,506 |
Percentage of revenue from contract with customer (as a percent) | 8.90% | 9.50% |
Service Calls, Maintenance and Monitoring |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 389,768 | $ 349,449 |
Percentage of revenue from contract with customer (as a percent) | 14.90% | 16.00% |
Mechanical Services |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 2,251,560 | $ 2,176,223 |
Percentage of revenue from contract with customer (as a percent) | 86.10% | 99.70% |
Electrical Services |  |  |
Disaggregation of Revenue |  |  |
Revenue | $ 363,717 | $ 6,656 |
Percentage of revenue from contract with customer (as a percent) | 13.90% | 0.30% |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 1,787,922
Percentage of revenue from contract with customer (as a percent) |  |  | 100.00%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Industrial |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 395,362
Percentage of revenue from contract with customer (as a percent) |  |  | 22.10%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Education |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 351,808
Percentage of revenue from contract with customer (as a percent) |  |  | 19.70%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Office Buildings |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 248,604
Percentage of revenue from contract with customer (as a percent) |  |  | 13.90%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Healthcare |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 224,643
Percentage of revenue from contract with customer (as a percent) |  |  | 12.60%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Government |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 140,843
Percentage of revenue from contract with customer (as a percent) |  |  | 7.90%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Retail, Restaurants and Entertainment |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 223,593
Percentage of revenue from contract with customer (as a percent) |  |  | 12.50%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Multi-Family and Residential |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 116,844
Percentage of revenue from contract with customer (as a percent) |  |  | 6.50%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Other |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 86,225
Percentage of revenue from contract with customer (as a percent) |  |  | 4.80%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | New Construction |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 684,687
Percentage of revenue from contract with customer (as a percent) |  |  | 38.30%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Existing Building Construction |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 580,737
Percentage of revenue from contract with customer (as a percent) |  |  | 32.40%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Service Projects |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 197,703
Percentage of revenue from contract with customer (as a percent) |  |  | 11.10%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Service Calls, Maintenance and Monitoring |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 324,795
Percentage of revenue from contract with customer (as a percent) |  |  | 18.20%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Mechanical Services |  |  |
Disaggregation of Revenue |  |  |
Revenue |  |  | $ 1,787,922
Percentage of revenue from contract with customer (as a percent) |  |  | 100.00%

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