LONG-TERM DEBT - Debt Instrument Redemption (Details) - Senior Notes	12 Months Ended
	Dec. 31, 2018
6.375% Senior Notes due June 1, 2024 (the 6.375% MTCH Senior Notes); interest payable each June 1 and December 1 | Period One
Debt Instrument
Redemption rate (as a percent)	104.781%
6.375% Senior Notes due June 1, 2024 (the 6.375% MTCH Senior Notes); interest payable each June 1 and December 1 | Period Two
Debt Instrument
Redemption rate (as a percent)	103.188%
6.375% Senior Notes due June 1, 2024 (the 6.375% MTCH Senior Notes); interest payable each June 1 and December 1 | Period Three
Debt Instrument
Redemption rate (as a percent)	101.594%
6.375% Senior Notes due June 1, 2024 (the 6.375% MTCH Senior Notes); interest payable each June 1 and December 1 | Period Four
Debt Instrument
Redemption rate (as a percent)	100.00%
5.00% Senior Notes due December 15, 2027 (the Match Group 5.00% Senior Notes); interest payable each June 15 and December 15, which commences on June 15, 2018 | Period One
Debt Instrument
Redemption rate (as a percent)	102.50%
5.00% Senior Notes due December 15, 2027 (the Match Group 5.00% Senior Notes); interest payable each June 15 and December 15, which commences on June 15, 2018 | Period Two
Debt Instrument
Redemption rate (as a percent)	101.667%
5.00% Senior Notes due December 15, 2027 (the Match Group 5.00% Senior Notes); interest payable each June 15 and December 15, which commences on June 15, 2018 | Period Three
Debt Instrument
Redemption rate (as a percent)	100.833%
5.00% Senior Notes due December 15, 2027 (the Match Group 5.00% Senior Notes); interest payable each June 15 and December 15, which commences on June 15, 2018 | Period Four
Debt Instrument
Redemption rate (as a percent)	100.00%
4.75% Senior Notes due December 15, 2022 (the 4.75% Senior Notes); interest payable each June 15 and December 15 | Period One
Debt Instrument
Redemption rate (as a percent)	101.583%
4.75% Senior Notes due December 15, 2022 (the 4.75% Senior Notes); interest payable each June 15 and December 15 | Period Two
Debt Instrument
Redemption rate (as a percent)	100.792%
4.75% Senior Notes due December 15, 2022 (the 4.75% Senior Notes); interest payable each June 15 and December 15 | Period Three
Debt Instrument
Redemption rate (as a percent)	100.00%