OTHER NON-CURRENT ASSETS (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Other Assets, Noncurrent Disclosure [Abstract]
Deferred contract cost term	26 months	32 months
Increase in amortization expense	$ 3.4
Increase in basic and diluted loss per share (usd per share)	$ 0.05

Change in Accounting Estimate, Increase in Basic and Diluted Net Loss Per Share

No definition available.

Name:	yelp_ChangeInAccountingEstimateIncreaseInBasicAndDilutedNetLossPerShare
Namespace Prefix:	yelp_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration