THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 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
Accounts receivable, net of allowance of $8,908 and $11,088, respectively	$ 235,181,000		$ 229,830,000
Google Inc.
Revenue from major customers
Revenue earned	376,100,000	328,900,000
Accounts receivable, net of allowance of $8,908 and $11,088, respectively	$ 137,000,000		$ 125,300,000