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Debt Obligations - Other (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) item | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) item | Sep. 30, 2020 USD ($) | Aug. 01, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Obligations |  |  |  |  |  |  |  |  |  |
Payments on term loan |  |  |  |  |  |  | $ 15,000 | $ 15,000 |  |
Outstanding balance | $ 272,938 |  |  |  |  |  | 272,938 |  |  | $ 236,000
Reconciliation of Credit Facility Adjusted EBITDA to net income |  |  |  |  |  |  |  |  |  |
Net income | 46,297 | $ 32,965 | $ 26,491 | $ 50,088 | $ 39,495 | $ 17,716 | 105,753 | 107,299 |  |
Provision for income taxes | 14,999 |  |  | $ 8,279 |  |  | 33,553 | 30,100 |  |
Stock-based compensation |  |  |  |  |  |  | 7,378 | $ 5,949 |  |
Amteck |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Acquired debt |  |  |  |  |  |  |  |  | $ 785 |
Revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Borrowing capacity | 450,000 |  |  |  |  |  | 450,000 |  |  |
Outstanding borrowings | 115,000 |  |  |  |  |  | 115,000 |  |  |
Outstanding balance | 115,000 |  |  |  |  |  | 115,000 |  |  | 70,000
Letters of credit amount outstanding | 49,500 |  |  |  |  |  | 49,500 |  |  |
Credit available | $ 285,500 |  |  |  |  |  | $ 285,500 |  |  |
Principal financial covenants |  |  |  |  |  |  |  |  |  |
Number of interest rate options | item |  |  |  |  |  |  | 2 |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) | 1.30% |  |  |  |  |  | 1.30% |  |  |
Revolving credit facility | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Letter of credit fees (as a percent) |  |  |  |  |  |  | 1.25% |  |  |
Commitment fees payable on unused portion of the facility (as a percent) |  |  |  |  |  |  | 0.20% |  |  |
Revolving credit facility | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Letter of credit fees (as a percent) |  |  |  |  |  |  | 2.00% |  |  |
Commitment fees payable on unused portion of the facility (as a percent) |  |  |  |  |  |  | 0.35% |  |  |
Revolving credit facility | Base Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  | 0.25% |  |  |
Revolving credit facility | Base Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  | 0.50% |  |  |
Revolving credit facility | Base Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  | 0.75% |  |  |
Revolving credit facility | Base Rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  | 1.00% |  |  |
Revolving credit facility | Eurodollar rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: Less than 0.75 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  | 1.25% |  |  |
Revolving credit facility | Eurodollar rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 0.75 to 1.50 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  | 1.50% |  |  |
Revolving credit facility | Eurodollar rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 1.50 to 2.25 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  | 1.75% |  |  |
Revolving credit facility | Eurodollar rate | Consolidated Total Indebtedness to Credit Facility Adjusted EBITDA: 2.25 or greater |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage [Abstract] |  |  |  |  |  |  |  |  |  |
Additional per annum interest margin (as a percent) |  |  |  |  |  |  | 2.00% |  |  |
Amended senior revolving credit facility |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Borrowing capacity | $ 570,000 |  |  |  |  |  | $ 570,000 |  |  | 600,000
Line of credit borrowing capacity accordion option | 150,000 |  |  |  |  |  | 150,000 |  |  |
Payments on term loan |  |  |  |  |  |  | 30,000 |  |  |
Term loan |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Borrowing capacity | 150,000 |  |  |  |  |  | 150,000 |  |  |
Outstanding balance | $ 120,000 |  |  |  |  |  | $ 120,000 |  |  | 135,000
Other disclosures |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) | 1.30% |  |  |  |  |  | 1.30% |  |  |
Notes to former owners |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Cumulative number of companies acquired | item | 6 |  |  |  |  |  | 6 |  |  |
Outstanding balance | $ 35,500 |  |  |  |  |  | $ 35,500 |  |  | $ 31,000
Promissory note | Walker |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Outstanding balance | $ 6,000 |  |  |  |  |  | $ 6,000 |  |  |
Weighted average interest rate (as a percent) | 4.00% |  |  |  |  |  | 4.00% |  |  |
Promissory note | TAS Energy |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Outstanding balance | $ 4,000 |  |  |  |  |  | $ 4,000 |  |  |
Weighted average interest rate (as a percent) | 3.50% |  |  |  |  |  | 3.50% |  |  |
Promissory note | T E C Industrial Construction and Maintenance |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Outstanding balance | $ 7,000 |  |  |  |  |  | $ 7,000 |  |  |
Weighted average interest rate (as a percent) | 2.50% |  |  |  |  |  | 2.50% |  |  |
Promissory note | Electrical Contractor North Carolina |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Outstanding balance | $ 5,000 |  |  |  |  |  | $ 5,000 |  |  |
Weighted average interest rate (as a percent) | 3.00% |  |  |  |  |  | 3.00% |  |  |
Promissory note | Amteck |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Outstanding balance | $ 10,000 |  |  |  |  |  | $ 10,000 |  |  |
Weighted average interest rate (as a percent) | 2.50% |  |  |  |  |  | 2.50% |  |  |
Promissory note | Mechanical Contractor Utah |  |  |  |  |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Outstanding balance | $ 3,500 |  |  |  |  |  | $ 3,500 |  |  |
Weighted average interest rate (as a percent) | 2.50% |  |  |  |  |  | 2.50% |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |
Debt Obligations |  |  |  |  |  |  |  |  |  |
Borrowing capacity | $ 160,000 |  |  |  |  |  | $ 160,000 |  |  |

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