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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2020
Summary of Significant Accounting Policies |
Schedule of disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended March 31,
Revenue by Service Provided |  |  | 2020 | ​ |  | 2019 | ​
Mechanical Services | ​ | ​ | $ | 565,464 |  | 80.8 | % | ​ | $ | 534,585 |  | 99.3 | %
Electrical Services | ​ | ​ | ​ | 134,667 | ​ | 19.2 | % | ​ | ​ | 3,888 | ​ | 0.7 | %
Total | ​ | ​ | $ | 700,131 | ​ | 100.0 | % | ​ | $ | 538,473 | ​ | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended March 31,
Revenue by Type of Customer | ​ | ​ | 2020 | ​ | ​ | 2019 |
Industrial | ​ | ​ | $ | 275,198 | ​ | 39.3 | % | ​ | $ | 168,660 | ​ | 31.3 | %
Education | ​ | ​ | ​ | 109,584 | ​ | 15.7 | % | ​ | ​ | 66,743 | ​ | 12.4 | %
Office Buildings | ​ | ​ | ​ | 75,572 | ​ | 10.8 | % | ​ | ​ | 66,212 | ​ | 12.3 | %
Healthcare | ​ | ​ | ​ | 99,259 | ​ | 14.2 | % | ​ | ​ | 92,023 | ​ | 17.1 | %
Government | ​ | ​ | ​ | 38,981 | ​ | 5.6 | % | ​ | ​ | 32,279 | ​ | 6.0 | %
Retail, Restaurants and Entertainment | ​ | ​ | ​ | 61,203 | ​ | 8.7 | % | ​ | ​ | 59,391 | ​ | 11.0 | %
Multi-Family and Residential | ​ | ​ | ​ | 18,731 | ​ | 2.7 | % | ​ | ​ | 30,235 | ​ | 5.6 | %
Other | ​ | ​ | ​ | 21,603 | ​ | 3.0 | % | ​ | ​ | 22,930 | ​ | 4.3 | %
Total | ​ | ​ | $ | 700,131 | ​ | 100.0 | % | ​ | $ | 538,473 | ​ | 100.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended March 31,
Revenue by Activity Type | ​ | ​ | 2020 | ​ | ​ | 2019 |
New Construction | ​ | ​ | $ | 347,400 | ​ | 49.6 | % | ​ | $ | 223,960 | ​ | 41.6 | %
Existing Building Construction | ​ | ​ | ​ | 207,166 | ​ | 29.6 | % | ​ | ​ | 182,296 | ​ | 33.8 | %
Service Projects | ​ | ​ | ​ | 51,648 | ​ | 7.4 | % | ​ | ​ | 50,384 | ​ | 9.4 | %
Service Calls, Maintenance and Monitoring | ​ | ​ | ​ | 93,917 | ​ | 13.4 | % | ​ | ​ | 81,833 | ​ | 15.2 | %
Total | ​ | ​ | $ | 700,131 | ​ | 100.0 | % | ​ | $ | 538,473 | ​ | 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) | ​ | 2,754 | ​ | ​ | 1,797 | ​ | ​ | — | ​ | ​ | 4,551
Deductions for uncollectible receivables written off, net of recoveries | ​ | (234) | ​ | ​ | (6) | ​ | ​ | — | ​ | ​ | (240)
Credit allowance of acquired companies on the acquisition date | ​ | — | ​ | ​ | 352 | ​ | ​ | — | ​ | ​ | 352
Purchase accounting adjustments | ​ | — | ​ | ​ | 72 | ​ | ​ | — | ​ | ​ | 72
Reclass to other current liabilities | ​ | — | ​ | ​ | — | ​ | ​ | (315) | ​ | ​ | (315)
Balance at March 31, 2020 | $ | 6,022 | ​ | $ | 5,946 | ​ | $ | 54 | ​ | $ | 12,022
Schedule of contract assets and liabilities | The following table presents the changes in contract assets and contract liabilities (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended March 31, | ​ | ​ | 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 | ​ | 436 | ​ | ​ | 12,851 | ​ | ​ | 6,573 | ​ | ​ | 31,556
Change due to conditional versus unconditional | ​ | 4,394 | ​ | ​ | — | ​ | ​ | (14,050) | ​ | ​ | —
Change in timing for performance obligation to be satisfied | ​ | — | ​ | ​ | 35,337 | ​ | ​ | — | ​ | ​ | 4,376
Change related to credit allowance | ​ | (25) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Balance at end of period | $ | 7,541 | ​ | $ | 215,106 | ​ | $ | 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): ​
​ | ​ | ​ | ​ | ​ | ​
​ | March 31, 2020 | ​ | December 31, 2019
Lease right-of-use assets | $ | 82,301 | ​ | $ | 84,073
Lease liabilities: | ​ | ​ | ​ | ​ | ​
Other current liabilities | ​ | 14,515 | ​ | ​ | 14,016
Long-term lease liabilities | ​ | 70,410 | ​ | ​ | 72,697
Total lease liabilities | $ | 84,925 | ​ | $ | 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 three months ended March 31, 2020) | ​ | $ | 13,376
2021 | ​ | ​ | 15,511
2022 | ​ | ​ | 13,261
2023 | ​ | ​ | 10,945
2024 | ​ | ​ | 9,436
Thereafter | ​ | ​ | 36,982
Total Lease Payments | ​ | ​ | 99,511
Less—Present Value Discount | ​ | ​ | (14,586)
Present Value of Lease Liabilities | ​ | $ | 84,925
Schedule of supplemental information related to leases | Supplemental information related to leases was as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended March 31,
​ | 2020 | ​ | 2019
Cash paid for amounts included in the measurement of lease liabilities | $ | 4,473 | ​ | $ | 3,778
Lease right-of-use assets obtained in exchange for lease liabilities | $ | 2,278 | ​ | $ | 174

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