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SIGNIFICANT ACCOUNTING POLICIES - Government subsidies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SIGNIFICANT ACCOUNTING POLICIES |  |  |
Government subsidy income | $ 683 | $ 863 | $ 573
Government subsidy recognized as deduction of cost of revenues | $ 1,098 | $ 0 | $ 0

X
- Definition Amount of income earned in the form of government subsidy. + References No definition available. + Details
Name: | ryb_GovernmentSubsidyIncome
Namespace Prefix: | ryb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of income earned in the form of government subsidy recognized as deduction of cost of revenues. + References No definition available. + Details
Name: | ryb_GovernmentSubsidyIncomeAsDeductionOfCostOfRevenues
Namespace Prefix: | ryb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration