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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2020
Summary of Significant Accounting Policies |
Schedule of disaggregation of revenue |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30,
Revenue by Service Provided |  | 2020 | ​ |  | 2019 | ​ |  | 2020 | ​ |  | 2019 | ​
Mechanical Services | ​ | $ | 621,140 |  | 87.0 | % | ​ | $ | 590,016 |  | 83.5 | % | ​ | $ | 1,809,304 |  | 83.9 | % | ​ | $ | 1,677,632 |  | 88.5 | %
Electrical Services | ​ | ​ | 92,959 | ​ | 13.0 | % | ​ | ​ | 116,902 | ​ | 16.5 | % | ​ | ​ | 348,394 | ​ | 16.1 | % | ​ | ​ | 218,061 | ​ | 11.5 | %
Total | ​ | $ | 714,099 | ​ | 100.0 | % | ​ | $ | 706,918 | ​ | 100.0 | % | ​ | $ | 2,157,698 | ​ | 100.0 | % | ​ | $ | 1,895,693 | ​ | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30,
Revenue by Type of Customer | ​ | 2020 | ​ | ​ | 2019 |  | ​ | 2020 | ​ | ​ | 2019 |
Industrial | ​ | $ | 268,651 | ​ | 37.6 | % | ​ | $ | 222,156 | ​ | 31.4 | % | ​ | $ | 844,719 | ​ | 39.1 | % | ​ | $ | 588,818 | ​ | 31.1 | %
Education | ​ | ​ | 135,992 | ​ | 19.0 | % | ​ | ​ | 125,836 | ​ | 17.8 | % | ​ | ​ | 375,580 | ​ | 17.4 | % | ​ | ​ | 292,799 | ​ | 15.4 | %
Office Buildings | ​ | ​ | 81,183 | ​ | 11.4 | % | ​ | ​ | 83,271 | ​ | 11.8 | % | ​ | ​ | 232,349 | ​ | 10.8 | % | ​ | ​ | 254,966 | ​ | 13.5 | %
Healthcare | ​ | ​ | 86,061 | ​ | 12.1 | % | ​ | ​ | 126,909 | ​ | 18.0 | % | ​ | ​ | 281,370 | ​ | 13.0 | % | ​ | ​ | 306,810 | ​ | 16.2 | %
Government | ​ | ​ | 40,631 | ​ | 5.7 | % | ​ | ​ | 41,502 | ​ | 5.9 | % | ​ | ​ | 119,444 | ​ | 5.5 | % | ​ | ​ | 118,224 | ​ | 6.2 | %
Retail, Restaurants and Entertainment | ​ | ​ | 64,212 | ​ | 9.0 | % | ​ | ​ | 67,141 | ​ | 9.5 | % | ​ | ​ | 190,043 | ​ | 8.8 | % | ​ | ​ | 184,618 | ​ | 9.7 | %
Multi-Family and Residential | ​ | ​ | 21,776 | ​ | 3.0 | % | ​ | ​ | 24,121 | ​ | 3.4 | % | ​ | ​ | 61,062 | ​ | 2.8 | % | ​ | ​ | 83,417 | ​ | 4.4 | %
Other | ​ | ​ | 15,593 | ​ | 2.2 | % | ​ | ​ | 15,982 | ​ | 2.2 | % | ​ | ​ | 53,131 | ​ | 2.6 | % | ​ | ​ | 66,041 | ​ | 3.5 | %
Total | ​ | $ | 714,099 | ​ | 100.0 | % | ​ | $ | 706,918 | ​ | 100.0 | % | ​ | $ | 2,157,698 | ​ | 100.0 | % | ​ | $ | 1,895,693 | ​ | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30,
Revenue by Activity Type | ​ | 2020 | ​ | ​ | 2019 |  | ​ | 2020 | ​ | ​ | 2019 |
New Construction | ​ | $ | 310,000 | ​ | 43.4 | % | ​ | $ | 312,279 | ​ | 44.2 | % | ​ | $ | 1,034,833 | ​ | 48.0 | % | ​ | $ | 827,718 | ​ | 43.7 | %
Existing Building Construction | ​ | ​ | 235,798 | ​ | 33.0 | % | ​ | ​ | 224,125 | ​ | 31.6 | % | ​ | ​ | 668,067 | ​ | 30.9 | % | ​ | ​ | 605,819 | ​ | 31.9 | %
Service Projects | ​ | ​ | 69,162 | ​ | 9.7 | % | ​ | ​ | 62,668 | ​ | 8.9 | % | ​ | ​ | 179,188 | ​ | 8.3 | % | ​ | ​ | 171,860 | ​ | 9.1 | %
Service Calls, Maintenance and Monitoring | ​ | ​ | 99,139 | ​ | 13.9 | % | ​ | ​ | 107,846 | ​ | 15.3 | % | ​ | ​ | 275,610 | ​ | 12.8 | % | ​ | ​ | 290,296 | ​ | 15.3 | %
Total | ​ | $ | 714,099 | ​ | 100.0 | % | ​ | $ | 706,918 | ​ | 100.0 | % | ​ | $ | 2,157,698 | ​ | 100.0 | % | ​ | $ | 1,895,693 | ​ | 100.0 | %
Schedule of activity in allowance for credit losses | Activity in our allowance for credit losses consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Service | ​ | Construction | ​ | Other | ​ | Total
Balance at beginning of year | $ | 3,192 | ​ | $ | 3,400 | ​ | $ | 315 | ​ | $ | 6,907
Impact of new accounting standard | ​ | 310 | ​ | ​ | 331 | ​ | ​ | 54 | ​ | ​ | 695
Bad debt expense (benefit) | ​ | 2,651 | ​ | ​ | 2,678 | ​ | ​ | (11) | ​ | ​ | 5,318
Deductions for uncollectible receivables written off, net of recoveries | ​ | (913) | ​ | ​ | (623) | ​ | ​ | — | ​ | ​ | (1,536)
Credit allowance of acquired companies on the acquisition date | ​ | — | ​ | ​ | 502 | ​ | ​ | — | ​ | ​ | 502
Purchase accounting adjustments | ​ | — | ​ | ​ | 72 | ​ | ​ | — | ​ | ​ | 72
Reclass to other current liabilities | ​ | — | ​ | ​ | — | ​ | ​ | (315) | ​ | ​ | (315)
Balance at September 30, 2020 | $ | 5,240 | ​ | $ | 6,360 | ​ | $ | 43 | ​ | $ | 11,643
Schedule of contract assets and liabilities | The following table presents the changes in contract assets and contract liabilities (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Nine Months Ended September 30, | ​ | ​ | Year Ended December 31,
​ | 2020 | ​ | 2019
​ | Contract |  | Contract | ​ | Contract |  | Contract
​ | Assets | ​ | Liabilities | ​ | Assets | ​ | Liabilities
Balance at beginning of period | $ | 2,736 | ​ | $ | 166,918 | ​ | $ | 10,213 | ​ | $ | 130,986
Change due to acquisitions / disposals | ​ | 7,469 | ​ | ​ | 37,047 | ​ | ​ | 6,573 | ​ | ​ | 31,556
Change related to credit allowance | ​ | (79) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Other changes in the period | ​ | 15,256 | ​ | ​ | 13,489 | ​ | ​ | (14,050) | ​ | ​ | 4,376
Balance at end of period | $ | 25,382 | ​ | $ | 217,454 | ​ | $ | 2,736 |  | $ | 166,918
​
Schedule of lease assets and liabilities | The following table summarizes the lease assets and liabilities included in the consolidated Balance Sheet as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​
​ | September 30, 2020 | ​ | December 31, 2019
Lease right-of-use assets | $ | 95,815 | ​ | $ | 84,073
Lease liabilities: | ​ | ​ | ​ | ​ | ​
Other current liabilities | ​ | 16,368 | ​ | ​ | 14,016
Long-term lease liabilities | ​ | 81,638 | ​ | ​ | 72,697
Total lease liabilities | $ | 98,006 | ​ | $ | 86,713
Schedule of maturities of lease liabilities | The maturities of lease liabilities are as follows (in thousands): ​
​ | ​ | ​ | ​
Year ending December 31— | ​ | ​ | ​
2020 (excluding the nine months ended September 30, 2020) | ​ | $ | 5,306
2021 | ​ | ​ | 19,397
2022 | ​ | ​ | 16,353
2023 | ​ | ​ | 14,172
2024 | ​ | ​ | 12,671
Thereafter | ​ | ​ | 47,693
Total Lease Payments | ​ | ​ | 115,592
Less—Present Value Discount | ​ | ​ | (17,586)
Present Value of Lease Liabilities | ​ | $ | 98,006
Schedule of supplemental information related to leases | Supplemental information related to leases was as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ | 2020 | ​ | 2019 |  | 2020 | ​ | 2019
Cash paid for amounts included in the measurement of lease liabilities | $ | 5,362 | ​ | $ | 4,566 | ​ | $ | 15,140 | ​ | $ | 12,439
Lease right-of-use assets obtained in exchange for lease liabilities | $ | 1,880 | ​ | $ | 6,865 | ​ | $ | 24,080 | ​ | $ | 21,262

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