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Business Combinations - 2016 & 2015 Acquisitions (Details) - USD ($) $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 18, 2016 | Jun. 24, 2016 | Jan. 29, 2016 | Feb. 28, 2015 | Dec. 31, 2016 | Jun. 30, 2017 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2016
Business combinations |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation adjustments |  |  |  |  |  |  |  | $ (121) |  |  |
Operating income |  |  |  |  |  |  |  | 106,288 | $ 57,749 | $ 67,769 |
Goodwill |  |  |  |  | $ 127,226 |  | $ 124,161 | 153,374 | 127,226 | $ 124,161 |
Pipe Jacking |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Purchase of property, plant and equipment |  | $ 13,400 |  |  |  |  |  |  |  |  |
Aevenia |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration |  |  |  | $ 22,300 |  |  |  |  |  |  |
Fixed assets |  |  |  | 11,200 |  |  |  |  |  |  |
Intangibles assets |  |  |  | 3,800 |  |  |  |  |  |  |
Goodwill |  |  |  | 5,200 |  |  |  |  |  |  |
Working capital |  |  |  | $ 2,100 |  |  |  |  |  |  |
Revenue since acquisition |  |  |  |  |  |  | 23,700 | 24,500 | 26,400 |  |
Gross profit (loss) since acquisition |  |  |  |  |  |  | $ 2,400 | 1,400 | $ 1,000 |  |
Mueller |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration |  |  | $ 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 |  |  |  |  |  |  |  |
Northern |  |  |  |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration | $ 6,900 |  |  |  |  |  |  |  |  |  |
Purchase price allocation adjustments |  |  |  |  |  | $ (100) |  |  |  |  |
Intangibles assets |  |  |  |  |  | 3,000 |  |  |  |  |
Goodwill |  |  |  |  |  | 3,700 |  |  |  |  |
Working capital |  |  |  |  |  | $ 100 |  |  |  |  |
The period of time goodwill is deductible for income tax purposes | 15 years |  |  |  |  |  |  |  |  |  |
Revenue since acquisition |  |  |  |  | 2,000 |  |  | 19,100 |  |  |
Gross profit (loss) since acquisition |  |  |  |  | $ 600 |  |  | $ 1,100 |  |  |

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- Definition The period of goodwill and/or other intangible assets arising from a business combination that is expected to be deductible for tax purposes. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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