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Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue        
Receivable payment terms (in days)     30 days  
Revenue $ 594,536   $ 1,594,520  
Percentage of revenue from contract with customer (as a percent) 100.00%   100.00%  
Industrial        
Disaggregation of Revenue        
Revenue $ 184,174   $ 398,351  
Percentage of revenue from contract with customer (as a percent) 31.00%   25.00%  
Education        
Disaggregation of Revenue        
Revenue $ 115,202   $ 312,852  
Percentage of revenue from contract with customer (as a percent) 19.40%   19.60%  
Office Buildings        
Disaggregation of Revenue        
Revenue $ 75,871   $ 224,300  
Percentage of revenue from contract with customer (as a percent) 12.80%   14.10%  
Healthcare        
Disaggregation of Revenue        
Revenue $ 79,424   $ 214,537  
Percentage of revenue from contract with customer (as a percent) 13.30%   13.40%  
Government        
Disaggregation of Revenue        
Revenue $ 32,633   $ 106,065  
Percentage of revenue from contract with customer (as a percent) 5.50%   6.60%  
Retail, Restaurants and Entertainment        
Disaggregation of Revenue        
Revenue $ 60,908   $ 169,899  
Percentage of revenue from contract with customer (as a percent) 10.20%   10.70%  
Multi-Family and Residential        
Disaggregation of Revenue        
Revenue $ 33,903   $ 102,995  
Percentage of revenue from contract with customer (as a percent) 5.70%   6.50%  
Other        
Disaggregation of Revenue        
Revenue $ 12,421   $ 65,521  
Percentage of revenue from contract with customer (as a percent) 2.10%   4.10%  
New Construction        
Disaggregation of Revenue        
Revenue $ 232,192   $ 599,627  
Percentage of revenue from contract with customer (as a percent) 39.10%   37.60%  
Existing Building Construction        
Disaggregation of Revenue        
Revenue $ 203,618   $ 566,590  
Percentage of revenue from contract with customer (as a percent) 34.20%   35.50%  
Small Projects        
Disaggregation of Revenue        
Revenue $ 57,322   $ 149,083  
Percentage of revenue from contract with customer (as a percent) 9.60%   9.40%  
Service Calls, Maintenance and Monitoring        
Disaggregation of Revenue        
Revenue $ 101,404   $ 279,220  
Percentage of revenue from contract with customer (as a percent) 17.10%   17.50%  
HVAC and Plumbing        
Disaggregation of Revenue        
Revenue $ 540,733   $ 1,448,761  
Percentage of revenue from contract with customer (as a percent) 91.00%   90.90%  
Building Automation Control Systems        
Disaggregation of Revenue        
Revenue $ 25,822   $ 72,128  
Percentage of revenue from contract with customer (as a percent) 4.30%   4.50%  
Other        
Disaggregation of Revenue        
Revenue $ 27,981   $ 73,631  
Percentage of revenue from contract with customer (as a percent) 4.70%   4.60%  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Disaggregation of Revenue        
Revenue   $ 480,851   $ 1,326,850
Percentage of revenue from contract with customer (as a percent)   100.00%   100.00%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Industrial        
Disaggregation of Revenue        
Revenue   $ 110,569   $ 295,939
Percentage of revenue from contract with customer (as a percent)   23.00%   22.30%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Education        
Disaggregation of Revenue        
Revenue   $ 102,459   $ 253,321
Percentage of revenue from contract with customer (as a percent)   21.30%   19.10%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Office Buildings        
Disaggregation of Revenue        
Revenue   $ 49,646   $ 178,550
Percentage of revenue from contract with customer (as a percent)   10.30%   13.50%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Healthcare        
Disaggregation of Revenue        
Revenue   $ 60,427   $ 171,516
Percentage of revenue from contract with customer (as a percent)   12.60%   12.90%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Government        
Disaggregation of Revenue        
Revenue   $ 33,745   $ 105,304
Percentage of revenue from contract with customer (as a percent)   7.00%   7.90%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Retail, Restaurants and Entertainment        
Disaggregation of Revenue        
Revenue   $ 67,959   $ 167,853
Percentage of revenue from contract with customer (as a percent)   14.10%   12.70%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Multi-Family and Residential        
Disaggregation of Revenue        
Revenue   $ 29,335   $ 86,465
Percentage of revenue from contract with customer (as a percent)   6.10%   6.50%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Other        
Disaggregation of Revenue        
Revenue   $ 26,711   $ 67,902
Percentage of revenue from contract with customer (as a percent)   5.60%   5.10%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | New Construction        
Disaggregation of Revenue        
Revenue   $ 170,540   $ 497,443
Percentage of revenue from contract with customer (as a percent)   35.50%   37.50%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Existing Building Construction        
Disaggregation of Revenue        
Revenue   $ 163,932   $ 429,178
Percentage of revenue from contract with customer (as a percent)   34.10%   32.30%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Small Projects        
Disaggregation of Revenue        
Revenue   $ 50,232   $ 139,269
Percentage of revenue from contract with customer (as a percent)   10.40%   10.50%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Service Calls, Maintenance and Monitoring        
Disaggregation of Revenue        
Revenue   $ 96,147   $ 260,960
Percentage of revenue from contract with customer (as a percent)   20.00%   19.70%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | HVAC and Plumbing        
Disaggregation of Revenue        
Revenue   $ 446,035   $ 1,207,434
Percentage of revenue from contract with customer (as a percent)   92.80%   91.00%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Building Automation Control Systems        
Disaggregation of Revenue        
Revenue   $ 15,583   $ 66,343
Percentage of revenue from contract with customer (as a percent)   3.20%   5.00%
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Other        
Disaggregation of Revenue        
Revenue   $ 19,233   $ 53,073
Percentage of revenue from contract with customer (as a percent)   4.00%   4.00%
Minimum        
Disaggregation of Revenue        
Payments received term (in days)     30 days  
Maximum        
Disaggregation of Revenue        
Payments received term (in days)     90 days