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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue |  |  |  |
Revenue, Performance Obligation, Description of Payment Terms |  |  | We typically invoice our customers with payment terms of net due in 30 days |
Receivable payment terms (in days) |  |  | 30 days |
Revenue | $ 706,918 | $ 594,536 | $ 1,895,693 | $ 1,594,520
Percentage of revenue from contract with customer (as a percent) | 100.00% | 100.00% | 100.00% | 100.00%
Industrial |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 222,156 | $ 184,174 | $ 588,818 | $ 398,351
Percentage of revenue from contract with customer (as a percent) | 31.40% | 31.00% | 31.10% | 25.00%
Education |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 125,836 | $ 115,202 | $ 292,799 | $ 312,852
Percentage of revenue from contract with customer (as a percent) | 17.80% | 19.40% | 15.40% | 19.60%
Office Buildings |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 83,271 | $ 75,871 | $ 254,966 | $ 224,300
Percentage of revenue from contract with customer (as a percent) | 11.80% | 12.80% | 13.50% | 14.10%
Healthcare |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 126,909 | $ 79,424 | $ 306,810 | $ 214,537
Percentage of revenue from contract with customer (as a percent) | 18.00% | 13.30% | 16.20% | 13.40%
Government |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 41,502 | $ 32,633 | $ 118,224 | $ 106,065
Percentage of revenue from contract with customer (as a percent) | 5.90% | 5.50% | 6.20% | 6.60%
Retail, Restaurants and Entertainment |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 67,141 | $ 60,908 | $ 184,618 | $ 169,899
Percentage of revenue from contract with customer (as a percent) | 9.50% | 10.20% | 9.70% | 10.70%
Multi-Family and Residential |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 24,121 | $ 33,903 | $ 83,417 | $ 102,995
Percentage of revenue from contract with customer (as a percent) | 3.40% | 5.70% | 4.40% | 6.50%
Other |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 15,982 | $ 12,421 | $ 66,041 | $ 65,521
Percentage of revenue from contract with customer (as a percent) | 2.20% | 2.10% | 3.50% | 4.10%
New Construction |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 312,279 | $ 227,715 | $ 827,718 | $ 606,208
Percentage of revenue from contract with customer (as a percent) | 44.20% | 38.30% | 43.70% | 38.00%
Existing Building Construction |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 224,125 | $ 216,010 | $ 605,819 | $ 572,808
Percentage of revenue from contract with customer (as a percent) | 31.60% | 36.30% | 31.90% | 35.90%
Service Projects |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 62,668 | $ 56,557 | $ 171,860 | $ 150,890
Percentage of revenue from contract with customer (as a percent) | 8.90% | 9.50% | 9.10% | 9.50%
Service Calls, Maintenance and Monitoring |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 107,846 | $ 94,254 | $ 290,296 | $ 264,614
Percentage of revenue from contract with customer (as a percent) | 15.30% | 15.90% | 15.30% | 16.60%
HVAC and Plumbing |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 545,088 | $ 540,733 | $ 1,531,331 | $ 1,448,761
Percentage of revenue from contract with customer (as a percent) | 77.10% | 91.00% | 80.80% | 90.90%
Electrical Services |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 116,902 | $ 1,611 | $ 218,061 | $ 1,611
Percentage of revenue from contract with customer (as a percent) | 16.50% | 0.30% | 11.50% | 0.10%
Building Automation Control Systems |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 24,540 | $ 25,822 | $ 73,816 | $ 72,128
Percentage of revenue from contract with customer (as a percent) | 3.50% | 4.30% | 3.90% | 4.50%
Other. |  |  |  |
Disaggregation of Revenue |  |  |  |
Revenue | $ 20,388 | $ 26,370 | $ 72,485 | $ 72,020
Percentage of revenue from contract with customer (as a percent) | 2.90% | 4.40% | 3.80% | 4.50%
Minimum |  |  |  |
Disaggregation of Revenue |  |  |  |
Payments received term (in days) |  |  | 30 days |
Maximum |  |  |  |
Disaggregation of Revenue |  |  |  |
Payments received term (in days) |  |  | 90 days |

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