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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY
Issuance cost, net	$ 4,492

X

- Definition

The amount of stock issuance cost.

+ References

No definition available.

+ Details

Name:	ryb_StockIssuanceCost
Namespace Prefix:	ryb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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