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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, 2019 | Mar. 31, 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 | $ 538,473 | $ 464,941
Percentage of revenue from contract with customer (as a percent) | 100.00% | 100.00%
Industrial |  |
Disaggregation of Revenue |  |
Revenue | $ 168,660 | $ 100,100
Percentage of revenue from contract with customer (as a percent) | 31.30% | 21.50%
Education |  |
Disaggregation of Revenue |  |
Revenue | $ 66,743 | $ 88,203
Percentage of revenue from contract with customer (as a percent) | 12.40% | 19.00%
Office Buildings |  |
Disaggregation of Revenue |  |
Revenue | $ 66,212 | $ 69,120
Percentage of revenue from contract with customer (as a percent) | 12.30% | 14.90%
Healthcare |  |
Disaggregation of Revenue |  |
Revenue | $ 92,023 | $ 63,183
Percentage of revenue from contract with customer (as a percent) | 17.10% | 13.60%
Government |  |
Disaggregation of Revenue |  |
Revenue | $ 32,279 | $ 36,147
Percentage of revenue from contract with customer (as a percent) | 6.00% | 7.80%
Retail, Restaurants and Entertainment |  |
Disaggregation of Revenue |  |
Revenue | $ 59,391 | $ 52,787
Percentage of revenue from contract with customer (as a percent) | 11.00% | 11.30%
Multi-Family and Residential |  |
Disaggregation of Revenue |  |
Revenue | $ 30,235 | $ 33,052
Percentage of revenue from contract with customer (as a percent) | 5.60% | 7.10%
Other |  |
Disaggregation of Revenue |  |
Revenue | $ 22,931 | $ 22,349
Percentage of revenue from contract with customer (as a percent) | 4.30% | 4.80%
New Construction |  |
Disaggregation of Revenue |  |
Revenue | $ 223,961 | $ 185,282
Percentage of revenue from contract with customer (as a percent) | 41.60% | 39.90%
Existing Building Construction |  |
Disaggregation of Revenue |  |
Revenue | $ 182,296 | $ 156,758
Percentage of revenue from contract with customer (as a percent) | 33.80% | 33.70%
Service Projects |  |
Disaggregation of Revenue |  |
Revenue | $ 50,384 | $ 42,433
Percentage of revenue from contract with customer (as a percent) | 9.40% | 9.10%
Service Calls, Maintenance and Monitoring |  |
Disaggregation of Revenue |  |
Revenue | $ 81,833 | $ 80,468
Percentage of revenue from contract with customer (as a percent) | 15.20% | 17.30%
HVAC and Plumbing |  |
Disaggregation of Revenue |  |
Revenue | $ 481,990 | $ 424,017
Percentage of revenue from contract with customer (as a percent) | 89.50% | 91.20%
Building Automation Control Systems |  |
Disaggregation of Revenue |  |
Revenue | $ 29,014 | $ 20,045
Percentage of revenue from contract with customer (as a percent) | 5.40% | 4.30%
Other |  |
Disaggregation of Revenue |  |
Revenue | $ 27,469 | $ 20,879
Percentage of revenue from contract with customer (as a percent) | 5.10% | 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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