THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 country	Sep. 30, 2012	Sep. 30, 2013 brand visit country	Sep. 30, 2012	Dec. 31, 2012
Revenue from major customers
Minimum number of brands owned by the company			150
More than 1 billion monthly visits to company website			1,000,000,000
Number of countries where the company has consumer audiences	30		30
Revenue	$ 756,872	$ 714,470	$ 2,298,532	$ 2,035,682
Accounts receivable, net of allowance of $10,439 and $11,088, respectively	209,949		209,949		229,830
Google Inc.
Revenue from major customers
Revenue	369,900	357,200	1,200,000	1,000,000
Accounts receivable, net of allowance of $10,439 and $11,088, respectively	$ 115,000		$ 115,000		$ 125,300