Commitments and Contingencies Loss Contingencies (Details) (USD $)	3 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended	13 Months Ended	3 Months Ended
	Mar. 31, 2013 Users	Mar. 31, 2013 September 2009, Seoul Korea District Court, Trial	Mar. 31, 2013 January 2010, Seoul Korea High Court Users	Sep. 30, 2012 September 2012, Seoul Korea High Court Plaintiffs lawsuits	Sep. 30, 2014 January 2013, Seoul High Court Plaintiffs Users	Jan. 28, 2013 January 2013, Seoul Western District Court Plaintiffs lawsuits	Jan. 31, 2014 January 2013, Seoul Western District Court lawsuits	Sep. 30, 2014 Litigation in Appeal January 2013, Seoul High Court Users Plaintiffs	Sep. 30, 2014 Litigation in Appeal Korean Supreme Court Users
Litigation and Other Legal Matters
Approximate number of users, Korean Subsidiary IAC	20,000,000
Approximate number of users sueing Korean Subsidiary IAC	149,000		34,000	55	33,795	2,291		33,215
Number of representative suits in trial				3	18	2	2,284	10
Number of users with cases in review									33,218
Consolation money per user, Korean Court precedent		$ 200