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Tealstone Acquisition - Supplemental Pro Forma Information (Unaudited) (Details) - Tealstone - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Pro forma revenue | $ 304,219 | $ 255,002 | $ 749,176 | $ 657,773
Pro forma net income attributable to Sterling | $ 7,132 | $ 4,659 | $ 8,848 | $ 7,705

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