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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2019
Summary of Significant Accounting Policies |
Schedule of disaggregation or revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30,
Revenue by Service Provided |  | 2019 | ​ |  | 2018 | ​ |  | 2019 | ​ |  | 2018 | ​
HVAC and Plumbing | ​ | $ | 545,088 |  | 77.1 | % | ​ | $ | 540,733 |  | 91.0 | % | ​ | $ | 1,531,331 |  | 80.8 | % | ​ | $ | 1,448,761 |  | 90.9 | %
Electrical Services | ​ | ​ | 116,902 | ​ | 16.5 | % | ​ | ​ | 1,611 | ​ | 0.3 | % | ​ | ​ | 218,061 | ​ | 11.5 | % | ​ | ​ | 1,611 | ​ | 0.1 | %
Building Automation Control Systems | ​ | ​ | 24,540 | ​ | 3.5 | % | ​ | ​ | 25,822 | ​ | 4.3 | % | ​ | ​ | 73,816 | ​ | 3.9 | % | ​ | ​ | 72,128 | ​ | 4.5 | %
Other | ​ | ​ | 20,388 | ​ | 2.9 | % | ​ | ​ | 26,370 | ​ | 4.4 | % | ​ | ​ | 72,485 | ​ | 3.8 | % | ​ | ​ | 72,020 | ​ | 4.5 | %
Total | ​ | $ | 706,918 | ​ | 100.0 | % | ​ | $ | 594,536 | ​ | 100.0 | % | ​ | $ | 1,895,693 | ​ | 100.0 | % | ​ | $ | 1,594,520 | ​ | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30,
Revenue by Type of Customer | ​ | 2019 | ​ | ​ | 2018 |  | ​ | 2019 | ​ | ​ | 2018 |
Industrial | ​ | $ | 222,156 | ​ | 31.4 | % | ​ | $ | 184,174 | ​ | 31.0 | % | ​ | $ | 588,818 | ​ | 31.1 | % | ​ | $ | 398,351 | ​ | 25.0 | %
Education | ​ | ​ | 125,836 | ​ | 17.8 | % | ​ | ​ | 115,202 | ​ | 19.4 | % | ​ | ​ | 292,799 | ​ | 15.4 | % | ​ | ​ | 312,852 | ​ | 19.6 | %
Office Buildings | ​ | ​ | 83,271 | ​ | 11.8 | % | ​ | ​ | 75,871 | ​ | 12.8 | % | ​ | ​ | 254,966 | ​ | 13.5 | % | ​ | ​ | 224,300 | ​ | 14.1 | %
Healthcare | ​ | ​ | 126,909 | ​ | 18.0 | % | ​ | ​ | 79,424 | ​ | 13.3 | % | ​ | ​ | 306,810 | ​ | 16.2 | % | ​ | ​ | 214,537 | ​ | 13.4 | %
Government | ​ | ​ | 41,502 | ​ | 5.9 | % | ​ | ​ | 32,633 | ​ | 5.5 | % | ​ | ​ | 118,224 | ​ | 6.2 | % | ​ | ​ | 106,065 | ​ | 6.6 | %
Retail, Restaurants and Entertainment | ​ | ​ | 67,141 | ​ | 9.5 | % | ​ | ​ | 60,908 | ​ | 10.2 | % | ​ | ​ | 184,618 | ​ | 9.7 | % | ​ | ​ | 169,899 | ​ | 10.7 | %
Multi-Family and Residential | ​ | ​ | 24,121 | ​ | 3.4 | % | ​ | ​ | 33,903 | ​ | 5.7 | % | ​ | ​ | 83,417 | ​ | 4.4 | % | ​ | ​ | 102,995 | ​ | 6.5 | %
Other | ​ | ​ | 15,982 | ​ | 2.2 | % | ​ | ​ | 12,421 | ​ | 2.1 | % | ​ | ​ | 66,041 | ​ | 3.5 | % | ​ | ​ | 65,521 | ​ | 4.1 | %
Total | ​ | $ | 706,918 | ​ | 100.0 | % | ​ | $ | 594,536 | ​ | 100.0 | % | ​ | $ | 1,895,693 | ​ | 100.0 | % | ​ | $ | 1,594,520 | ​ | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30,
Revenue by Activity Type | ​ | 2019 | ​ | ​ | 2018 |  | ​ | 2019 | ​ | ​ | 2018 |
New Construction | ​ | $ | 312,279 | ​ | 44.2 | % | ​ | $ | 227,715 | ​ | 38.3 | % | ​ | $ | 827,718 | ​ | 43.7 | % | ​ | $ | 606,208 | ​ | 38.0 | %
Existing Building Construction | ​ | ​ | 224,125 | ​ | 31.6 | % | ​ | ​ | 216,010 | ​ | 36.3 | % | ​ | ​ | 605,819 | ​ | 31.9 | % | ​ | ​ | 572,808 | ​ | 35.9 | %
Service Projects | ​ | ​ | 62,668 | ​ | 8.9 | % | ​ | ​ | 56,557 | ​ | 9.5 | % | ​ | ​ | 171,860 | ​ | 9.1 | % | ​ | ​ | 150,890 | ​ | 9.5 | %
Service Calls, Maintenance and Monitoring | ​ | ​ | 107,846 | ​ | 15.3 | % | ​ | ​ | 94,254 | ​ | 15.9 | % | ​ | ​ | 290,296 | ​ | 15.3 | % | ​ | ​ | 264,614 | ​ | 16.6 | %
Total | ​ | $ | 706,918 | ​ | 100.0 | % | ​ | $ | 594,536 | ​ | 100.0 | % | ​ | $ | 1,895,693 | ​ | 100.0 | % | ​ | $ | 1,594,520 | ​ | 100.0 | %
Schedule of contract assets and liabilities | The following table presents the changes in contract assets and contract liabilities (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Nine Months Ended | ​ | Year Ended
​ | September 30, 2019 | ​ | December 31, 2018
​ | Contract |  | Contract | ​ | Contract |  | Contract
​ | Assets | ​ | Liabilities | ​ | Assets | ​ | Liabilities
Balance at beginning of period | $ | 10,213 | ​ | $ | 130,986 | ​ | $ | 30,116 | ​ | $ | 106,005
Change due to acquisitions / disposals | ​ | 6,573 | ​ | ​ | 31,556 | ​ | ​ | 2,833 | ​ | ​ | 8,195
Change due to conditional versus unconditional | ​ | (10,665) | ​ | ​ | — | ​ | ​ | 6,244 | ​ | ​ | —
Reclassified to unbilled accounts receivable | ​ | — | ​ | ​ | — | ​ | ​ | (28,980) | ​ | ​ | —
Change in timing for performance obligation to be satisfied | ​ | — | ​ | ​ | 4,555 | ​ | ​ | — | ​ | ​ | 16,786
Balance at end of period | $ | 6,121 | ​ | $ | 167,097 | ​ | $ | 10,213 |  | $ | 130,986
​
Schedule of lease asset and liabilities | The following table summarizes the lease asset and liabilities included in the consolidated Balance Sheet as follows (in thousands): ​
​ | ​ | ​
​ | September 30, 2019
Lease right-of-use assets | $ | 84,281
Lease liabilities: | ​ | ​
Other current liabilities | ​ | 13,549
Long-term lease liabilities | ​ | 73,213
Total lease liabilities | $ | 86,762
Schedule of maturities of lease liabilities | The maturities of lease liabilities are as follows (in thousands): ​
​ | ​ | ​ | ​
Year ending December 31— | ​ | ​ | ​
2019 (excluding the nine months ended September 30, 2019) | ​ | $ | 4,326
2020 | ​ | ​ | 16,288
2021 | ​ | ​ | 14,477
2022 | ​ | ​ | 12,291
2023 | ​ | ​ | 10,328
Thereafter | ​ | ​ | 44,617
Total Lease Payments | ​ | ​ | 102,327
Less—Present Value Discount | ​ | ​ | (15,565)
Present Value of Lease Liabilities | ​ | $ | 86,762
Schedule of supplemental information related to leases | Supplemental information related to leases was as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended | ​ | Nine Months Ended
​ | September 30, 2019 |  | September 30, 2019
Cash paid for amounts included in the measurement of lease liabilities | $ | 6,466 | ​ | $ | 18,426
Lease right-of-use assets obtained in exchange for lease liabilities | $ | 7,050 | ​ | $ | 10,768

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