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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2019
Summary of Significant Accounting Policies |
Schedule of disaggregation or revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​ | ​
Revenue by Service Provided | ​ | 2019 | ​ | ​ | 2018 | ​ | ​
HVAC and Plumbing | ​ | $ | 481,990 | ​ | 89.5 | % | ​ | $ | 424,017 | ​ | 91.2 | % | ​
Building Automation Control Systems | ​ | ​ | 29,014 | ​ | 5.4 | % | ​ | ​ | 20,045 | ​ | 4.3 | % | ​
Other | ​ | ​ | 27,469 | ​ | 5.1 | % | ​ | ​ | 20,879 | ​ | 4.5 | % | ​
Total | ​ | $ | 538,473 | ​ | 100.0 | % | ​ | $ | 464,941 | ​ | 100.0 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​ | ​
Revenue by Type of Customer |  | 2019 | ​ |  | 2018 |  |
Industrial | ​ | $ | 168,660 | ​ | 31.3 | % | ​ | $ | 100,100 |  | 21.5 | % | ​
Education | ​ | ​ | 66,743 | ​ | 12.4 | % | ​ | ​ | 88,203 | ​ | 19.0 | % | ​
Office Buildings | ​ | ​ | 66,212 | ​ | 12.3 | % | ​ | ​ | 69,120 | ​ | 14.9 | % | ​
Healthcare | ​ | ​ | 92,023 | ​ | 17.1 | % | ​ | ​ | 63,183 | ​ | 13.6 | % | ​
Government | ​ | ​ | 32,279 | ​ | 6.0 | % | ​ | ​ | 36,147 | ​ | 7.8 | % | ​
Retail, Restaurants and Entertainment | ​ | ​ | 59,391 | ​ | 11.0 | % | ​ | ​ | 52,787 | ​ | 11.3 | % | ​
Multi-Family and Residential | ​ | ​ | 30,235 | ​ | 5.6 | % | ​ | ​ | 33,052 | ​ | 7.1 | % | ​
Other | ​ | ​ | 22,931 | ​ | 4.3 | % | ​ | ​ | 22,349 | ​ | 4.8 | % | ​
Total | ​ | $ | 538,473 | ​ | 100.0 | % | ​ | $ | 464,941 | ​ | 100.0 | % | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​ | ​
Revenue by Activity Type |  | 2019 | ​ | ​ | 2018 |  |
New Construction | ​ | $ | 223,961 | ​ | 41.6 | % | ​ | $ | 185,282 | ​ | 39.9 | % | ​
Existing Building Construction | ​ | ​ | 182,296 | ​ | 33.8 | % | ​ | ​ | 156,758 | ​ | 33.7 | % | ​
Service Projects | ​ | ​ | 50,384 | ​ | 9.4 | % | ​ | ​ | 42,433 | ​ | 9.1 | % | ​
Service Calls, Maintenance and Monitoring | ​ | ​ | 81,833 | ​ | 15.2 | % | ​ | ​ | 80,468 | ​ | 17.3 | % | ​
Total | ​ | $ | 538,473 | ​ | 100.0 | % | ​ | $ | 464,941 | ​ | 100.0 | % | ​
Schedule of contract assets and liabilities | ​
​ | Three Months Ended | ​ | Year Ended
​ | March 31, 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 | ​ | 27 | ​ | ​ | 44 | ​ | ​ | 2,833 | ​ | ​ | 8,195
Change due to conditional versus unconditional | ​ | (1,954) | ​ | ​ | — | ​ | ​ | 6,244 | ​ | ​ | —
Reclassified to unbilled accounts receivable | ​ | — | ​ | ​ | — | ​ | ​ | (28,980) | ​ | ​ | —
Change in timing for performance obligation to be satisfied | ​ | — | ​ | ​ | (10,740) | ​ | ​ | — | ​ | ​ | 16,786
Balance at end of period | $ | 8,286 |  | $ | 120,290 | ​ | $ | 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):
​ | ​ | ​
​ | March 31,
​ | 2019
Lease right-of-use assets | $ | 70,316
Lease liabilities: | ​ | ​
Other current liabilities | ​ | 11,066
Long-term lease liabilities | ​ | 62,028
Total lease liabilities | $ | 73,094
Schedule of maturities of lease liabilities | The maturities of lease liabilities are as follows (in thousands): ​
​ | ​ | ​ | ​
Year ending December 31— | ​ | ​ | ​
2019 (excluding the three months ended March 31, 2019) | ​ | $ | 10,687
2020 | ​ | ​ | 12,508
2021 | ​ | ​ | 11,341
2022 | ​ | ​ | 9,410
2023 | ​ | ​ | 7,821
Thereafter | ​ | ​ | 35,541
Total Lease Payments | ​ | ​ | 87,308
Less—Present Value Discount | ​ | ​ | (14,214)
Present Value of Lease Liabilities | ​ | $ | 73,094
Schedule of supplemental information related to leases | Supplemental information related to leases was as follows (in thousands):
​ | ​ | ​
​ | Three Months Ended
​ | March 31, 2019
Cash paid for amounts included in the measurement of lease liabilities | $ | 5,904
Lease right-of-use assets obtained in exchange for lease liabilities | $ | 174

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