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Business Combinations - 2017 Acquisitions (Details) - USD ($) $ in Thousands |  |  |  | 7 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 16, 2017 | May 30, 2017 | May 26, 2017 | Dec. 31, 2017 | Dec. 31, 2017 | May 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business combinations |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 153,374 | $ 153,374 |  | $ 127,226 | $ 124,161
Power |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |
Goodwill |  |  |  | 24,391 | 24,391 |  | 24,512 | 20,731
Pipeline |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |
Goodwill |  |  |  | 51,521 | 51,521 |  | $ 42,252 | $ 42,252
FGC |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |
Cash payment made |  |  | $ 33,000 |  |  |  |  |
Potential contingent consideration |  |  | $ 1,500 |  |  | $ 1,500 |  |
Contingent earnout period (in years) |  |  | 1 year |  |  |  |  |
Fair value of the contingent consideration |  |  | $ 1,200 |  |  | $ 1,200 |  |
Fixed assets |  |  |  | 4,800 | 4,800 |  |  |
Working capital |  |  |  | 3,300 | 3,300 |  |  |
Intangibles assets |  |  |  | 9,100 | 9,100 |  |  |
Goodwill |  |  |  | 17,000 | 17,000 |  |  |
Land and buildings |  |  | $ 3,500 |  |  |  |  |
The period of time goodwill is deductible for income tax purposes |  |  | 15 years |  |  |  |  |
Revenue since acquisition |  |  |  | 15,500 |  |  |  |
Gross profit (loss) since acquisition |  |  |  | $ 3,800 |  |  |  |
Coastal |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |
Fixed assets | $ 4,000 |  |  |  |  |  |  |
Working capital | 4,600 |  |  |  |  |  |  |
Intangibles assets | 9,900 |  |  |  |  |  |  |
Goodwill | $ 9,300 |  |  |  |  |  |  |
The period of time goodwill is deductible for income tax purposes | 15 years |  |  |  |  |  |  |
Revenue since acquisition |  |  |  |  | 17,900 |  |  |
Gross profit (loss) since acquisition |  |  |  |  | $ 3,200 |  |  |
Long-term capital leases | $ 300 |  |  |  |  |  |  |
Coastal | Pipeline |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |
Cash payment made | $ 27,500 |  |  |  |  |  |  |
Engineering Assets |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |
Fixed assets |  | $ 200 |  |  |  |  |  |
Engineering Assets | Power |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |
Cash payment made |  | 2,300 |  |  |  |  |  |
Engineering Assets | Customer relationships |  |  |  |  |  |  |  |
Business combinations |  |  |  |  |  |  |  |
Intangibles assets |  | $ 2,100 |  |  |  |  |  |

X
- 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 Represents the period of meeting certain operating targets over which the contingent earnout is based, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter. + References No definition available. + Details
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- Definition Amount of land and buildings acquired, at the acquisition date. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of capital lease obligation, assumed at 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 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at 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 + 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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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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