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Tealstone Acquisition - Supplemental Pro Forma Information (Details) - Tealstone - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Pro forma revenue |  | $ 999,467 | $ 868,324
Pro forma net income attributable to Sterling |  | $ 12,401 | $ 2,156
Business combination, pro forma information, revenue of acquiree since acquisition date, actual | $ 136,900 |  |
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual | $ 16,500 |  |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a 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)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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