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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 639,770	$ 541,493	$ 1,739,862	$ 1,504,091
Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	628,266	530,949	1,709,831	1,472,211
Indirect Revenue (principally advertising revenue)
Disaggregation of Revenue [Line Items]
Revenue	11,504	10,544	30,031	31,880
North America | Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	321,806	268,863	869,471	758,135
International | Direct Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 306,460	$ 262,086	$ 840,360	$ 714,076