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BUSINESS ACQUISITIONS - Acquisition of Pro Forma information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Summary of unaudited pro forma result of operations    
Pro forma net revenue $ 165,309 $ 154,124
Pro forma net income attributable to RYB Education, Inc. $ 380 $ 9,442
Pro forma net income per ordinary share-basic $ 0.01 $ 0.38
Pro forma net income per ordinary share- diluted $ 0.01 $ 0.36