THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 801,835	$ 639,770	$ 2,177,207	$ 1,739,862
Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	785,725	628,266	2,135,228	1,709,831
Indirect Revenue (principally advertising revenue)
Disaggregation of Revenue [Line Items]
Revenue	16,110	11,504	41,979	30,031
Americas | Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	393,613	336,792	1,112,263	916,730
Europe | Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	217,680	181,627	603,281	492,167
APAC and Other | Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 174,432	$ 109,847	$ 419,684	$ 300,934