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Business Combinations - 2016 Acquisitions (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 18, 2016 | Jun. 24, 2016 | Jan. 29, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016
Business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 127,226 | $ 206,159 |  |  |  | $ 153,374 |  |  |  | $ 206,159 | $ 153,374 | $ 127,226 |
Purchase price allocation adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  | 121 |  |
Revenue |  |  |  |  | 877,670 | $ 908,902 | $ 648,787 | $ 504,119 | 579,017 | $ 608,311 | $ 631,165 | $ 561,502 | 2,939,478 | 2,379,995 | 1,996,948 |
Gross profit |  |  |  |  | 103,253 | $ 106,505 | $ 71,419 | $ 44,560 | 68,477 | $ 70,421 | 84,483 | $ 55,053 | 325,737 | 278,434 | 201,307 |
Fair value of net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 127,226 | $ 206,159 |  |  |  | $ 153,374 |  |  |  | 206,159 | 153,374 | 127,226 |
Pipe Jacking |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of property, plant and equipment |  | $ 13,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2016 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets |  |  |  | 2,133 |  |  |  |  |  |  |  |  |  |  | 2,133 |
Goodwill |  |  |  | 5,660 |  |  |  |  |  |  |  |  |  |  | 5,660 |
Intangibles assets |  |  |  | 3,000 |  |  |  |  |  |  |  |  |  |  | 3,000 |
Fair value of net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  |  | 1,606 |  |  |  |  |  |  |  |  |  |  | 1,606 |
Other current assets |  |  |  | 64 |  |  |  |  |  |  |  |  |  |  | 64 |
Property, plant and equipment |  |  |  | 2,133 |  |  |  |  |  |  |  |  |  |  | 2,133 |
Intangibles assets |  |  |  | 3,000 |  |  |  |  |  |  |  |  |  |  | 3,000 |
Goodwill |  |  |  | 5,660 |  |  |  |  |  |  |  |  |  |  | 5,660 |
Accounts payable and accrued liabilities |  |  |  | (1,587) |  |  |  |  |  |  |  |  |  |  | (1,587) |
Total |  |  |  | 10,876 |  |  |  |  |  |  |  |  |  |  | $ 10,876 |
Mueller |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 4,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000
Fair value of inventory acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100
The period of time goodwill is deductible for income tax purposes |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000
Northern |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 6,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | 3,700 |  |  |  |  |
The period of time goodwill is deductible for income tax purposes | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation adjustments |  |  |  |  |  |  |  |  |  |  | (100) |  |  |  |  |
Intangibles assets |  |  |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |
Working capital |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 44,500 | 19,100 |  |
Gross profit |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,200) | $ 1,100 |  |
Revenue since acquisition |  |  |  | 2,000 |  |  |  |  |  |  |  |  |  |  |  |
Gross profit since acquisition |  |  |  | $ 600 |  |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangibles assets |  |  |  |  |  |  |  |  |  |  | 3,000 |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  | $ 3,700 |  |  |  |  |

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