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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue
Revenue	$ 714,099	$ 706,918	$ 2,157,698	$ 1,895,693
Percentage of revenue from contract with customer (as a percent)	100.00%	100.00%	100.00%	100.00%
Industrial
Disaggregation of Revenue
Revenue	$ 268,651	$ 222,156	$ 844,719	$ 588,818
Percentage of revenue from contract with customer (as a percent)	37.60%	31.40%	39.10%	31.10%
Education
Disaggregation of Revenue
Revenue	$ 135,992	$ 125,836	$ 375,580	$ 292,799
Percentage of revenue from contract with customer (as a percent)	19.00%	17.80%	17.40%	15.40%
Office Buildings
Disaggregation of Revenue
Revenue	$ 81,183	$ 83,271	$ 232,349	$ 254,966
Percentage of revenue from contract with customer (as a percent)	11.40%	11.80%	10.80%	13.50%
Healthcare
Disaggregation of Revenue
Revenue	$ 86,061	$ 126,909	$ 281,370	$ 306,810
Percentage of revenue from contract with customer (as a percent)	12.10%	18.00%	13.00%	16.20%
Government
Disaggregation of Revenue
Revenue	$ 40,631	$ 41,502	$ 119,444	$ 118,224
Percentage of revenue from contract with customer (as a percent)	5.70%	5.90%	5.50%	6.20%
Retail, Restaurants and Entertainment
Disaggregation of Revenue
Revenue	$ 64,212	$ 67,141	$ 190,043	$ 184,618
Percentage of revenue from contract with customer (as a percent)	9.00%	9.50%	8.80%	9.70%
Multi-Family and Residential
Disaggregation of Revenue
Revenue	$ 21,776	$ 24,121	$ 61,062	$ 83,417
Percentage of revenue from contract with customer (as a percent)	3.00%	3.40%	2.80%	4.40%
Other
Disaggregation of Revenue
Revenue	$ 15,593	$ 15,982	$ 53,131	$ 66,041
Percentage of revenue from contract with customer (as a percent)	2.20%	2.20%	2.60%	3.50%
New Construction
Disaggregation of Revenue
Revenue	$ 310,000	$ 312,279	$ 1,034,833	$ 827,718
Percentage of revenue from contract with customer (as a percent)	43.40%	44.20%	48.00%	43.70%
Existing Building Construction
Disaggregation of Revenue
Revenue	$ 235,798	$ 224,125	$ 668,067	$ 605,819
Percentage of revenue from contract with customer (as a percent)	33.00%	31.60%	30.90%	31.90%
Service Projects
Disaggregation of Revenue
Revenue	$ 69,162	$ 62,668	$ 179,188	$ 171,860
Percentage of revenue from contract with customer (as a percent)	9.70%	8.90%	8.30%	9.10%
Service Calls, Maintenance and Monitoring
Disaggregation of Revenue
Revenue	$ 99,139	$ 107,846	$ 275,610	$ 290,296
Percentage of revenue from contract with customer (as a percent)	13.90%	15.30%	12.80%	15.30%
Mechanical Services
Disaggregation of Revenue
Revenue	$ 621,140	$ 590,016	$ 1,809,304	$ 1,677,632
Percentage of revenue from contract with customer (as a percent)	87.00%	83.50%	83.90%	88.50%
Electrical Services
Disaggregation of Revenue
Revenue	$ 92,959	$ 116,902	$ 348,394	$ 218,061
Percentage of revenue from contract with customer (as a percent)	13.00%	16.50%	16.10%	11.50%

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