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Subsequent Events (Details) shares in Thousands | Oct. 02, 2019 USD ($) shares | Oct. 21, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | ---
Subsequent Event [Line Items] |  |  |  |
Goodwill |  |  | $ 85,231,000 | $ 85,231,000
LK Gregory Construction, Plateau Excavation and DeWitt Excavation | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Aggregate consideration | $ 411,608,000 |  |  |
Payments to acquire businesses | $ 375,000,000 |  |  |
Common stock issued in acquisition (in shares) | shares | 1,245 |  |  |
Subordinated promissory note issued in acquisition | $ 10,000,000 |  |  |
Preliminary target working capital adjustment | $ 10,413,000 |  |  |
Net tangible assets acquired |  | $ 98,771,000 |  |
Intangible assets acquired |  | 162,675,000 |  |
Goodwill |  | $ 150,162,000 |  |
Measurement Input, Discount Rate | LK Gregory Construction, Plateau Excavation and DeWitt Excavation | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Subordinated promissory note discount rate | 0.08 |  |  |
Senior Secured Debt | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument face amount | $ 475,000,000 |  |  |
Loans Payable | Senior Secured First Lien Term Loan | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument face amount | 400,000,000 |  |  |
Option to increase aggregate principal amount | 100,000,000 |  |  |
Revolving Credit Facility [Member] | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Aggregate principal amount | 75,000,000 |  |  |
Letter of Credit | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Aggregate principal amount | 75,000,000 |  |  |
Swing Line Loan | Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Aggregate principal amount | $ 15,000,000 |  |  |

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