The percentage of annual increase of total number of shares issued and outstanding.

No definition available.

Name:	ryb_PercentageOfAnnualIncreaseOfSharesIssuedAndOutstanding
Namespace Prefix:	ryb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of quarters in share based arrangement vesting period.

+ References

No definition available.

+ Details

Name:	ryb_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodNumberOfQuarters
Namespace Prefix:	ryb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of quarterly vesting of share-based compensation awards.

+ References

No definition available.

+ Details

Name:	ryb_ShareBasedCompensationArrangementByShareBasedPaymentAwardQuarterlyAwardVestingRightsPercentage
Namespace Prefix:	ryb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of vesting of share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=ryb_EmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=ryb_DirectorAndConsultantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=ryb_CompletionOfInitialPublicOfferingBeforeJune222018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=ryb_NonCompletionOfInitialPublicOfferingBeforeJune222018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=ryb_ShareIncentivePlan2009Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=ryb_ShareIncentivePlan2017Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SHARE INCENTIVE PLAN (Details)				12 Months Ended
SHARE INCENTIVE PLAN (Details)	Jul. 01, 2017 $ / shares shares	Jun. 22, 2017 item $ / shares shares	Nov. 05, 2015 $ / shares shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2015 $ / shares shares	Dec. 31, 2016 $ / shares
SHARE INCENTIVE PLAN
Ordinary shares, par value (in dollars per share) \| $ / shares				$ 0.001		$ 0.001
Share options granted (in shares) \| shares				2,109,305	887,546
Exercise price per share of the options granted \| $ / shares				$ 11.42	$ 2.88
Directors
SHARE INCENTIVE PLAN
Share options granted (in shares) \| shares		1,286,878	887,546
Exercise price per share of the options granted \| $ / shares		$ 11.66	$ 2.88
Employees
SHARE INCENTIVE PLAN
Share options granted (in shares) \| shares		772,127
Exercise price per share of the options granted \| $ / shares		$ 11.66
Share options vested and exercisable (as a percent)		25.00%
Share options to be vested quarterly in twelve quarters (as a percent)		75.00%
Number of quarters of vesting \| item		12
Director and consultant
SHARE INCENTIVE PLAN
Share options granted (in shares) \| shares	50,300
Exercise price per share of the options granted \| $ / shares	$ 1.48
Completion of IPO before June 22, 2018 \| Directors
SHARE INCENTIVE PLAN
Share options vested and exercisable (as a percent)		25.00%
Share options to be vested quarterly in twelve quarters (as a percent)		75.00%
Number of quarters of vesting \| item		12
Non completion of IPO before June 22, 2018 \| Directors
SHARE INCENTIVE PLAN
Share options vested and exercisable (as a percent)		25.00%
Share options to be vested quarterly in twelve quarters (as a percent)		75.00%
Number of quarters of vesting \| item		12
2009 Share Incentive Plan
SHARE INCENTIVE PLAN
Total number shares authorized \| shares				2,573,756
Ordinary shares, par value (in dollars per share) \| $ / shares				$ 0.001
2017 Share Incentive Plan
SHARE INCENTIVE PLAN
Total number shares authorized \| shares				2,059,005
Additional annual increase in number of shares (as a percent)				2.00%