SIGNIFICANT ACCOUNTING POLICIES - Value added taxes (Details)	12 Months Ended	20 Months Ended
Dec. 31, 2017	Dec. 31, 2017
SIGNIFICANT ACCOUNTING POLICIES
Value added tax rate on gross sales (in percent)	17.00%
Value added tax rate for general VAT payer (in percent)		6.00%
Value added tax rate for small scale VAT payer (in percent)		3.00%

The percentage of value added tax rate for small scale VAT payer under Pilot Program where the PRC Ministry of Finance and the State Administration of Taxation officially launched a pilot VAT reform program ("Pilot Program"), applicable to businesses in selected industries.

No definition available.

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