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Fair Value Measurements - Contingent Consideration Liability (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 26, 2017 USD ($) | Dec. 31, 2017 USD ($) item | Mar. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2015 USD ($) | May 31, 2017 USD ($)
Rollforward of contingent consideration liability level three fair value measurements |  |  |  |  |  |
Change in fair value of contingent consideration liability during year |  |  |  | $ (484) | $ (6,722) |
FGC |  |  |  |  |  |
Additional information |  |  |  |  |  |
Contingent consideration in cash | $ 1,500 |  |  |  |  | $ 1,500
Fair value of the contingent consideration | 1,200 |  |  |  |  | $ 1,200
Contingent consideration credited to non-operating income |  | $ 500 |  |  |  |
Payment to Q3C sellers for meeting performance targets | $ 33,000 |  |  |  |  |
Q3 Contracting |  |  |  |  |  |
Additional information |  |  |  |  |  |
Payment to Q3C sellers for meeting performance targets |  |  | $ 5,000 |  |  |
Contingent Consideration Liability | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Rollforward of contingent consideration liability level three fair value measurements |  |  |  |  |  |
Florida Gas Contractors acquisition |  |  |  | 1,200 |  |
Change in fair value of contingent consideration liability during year |  |  |  | (484) |  |
Balance at the end of the period |  | $ 716 |  | $ 716 |  |
Additional information |  |  |  |  |  |
Number of unobservable inputs | item |  | 2 |  | 2 |  |
Minimum probability of acquired entity meeting contractual operating performance target (as a percent) |  |  |  | 33.00% |  |
Maximum probability of acquired entity meeting contractual operating performance target (as a percent) |  |  |  | 100.00% |  |

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- Definition Represents the contingent consideration credited to non-operating income upon not meeting earnout target in a business combination. + References No definition available. + Details
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- Definition Represents the maximum probability of the acquired entity meeting the contractual operating performance target expressed as a percentage. + References No definition available. + Details
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- Definition Represents the minimum probability of acquired entity meeting the contractual operating performance target expressed as a percentage. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + 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 Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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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