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SIGNIFICANT ACCOUNTING POLICIES - Government subsidies (Details) - USD ($) $ in Thousands	12 Months Ended
	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

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Data Type:	xbrli:monetaryItemType
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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