EARNINGS PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								6 Months Ended		12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator: Basic
Net earnings from continuing operations	$ 140,179	$ 131,487	$ 132,921	$ 149,324	$ 119,934	$ 137,791	$ 119,226	$ 117,682			$ 553,911	$ 494,633	$ 451,104
Net earnings attributable to noncontrolling interests											(59,599)	(103,401)	(85,187)
Net earnings from continuing operations attributable to Match Group, Inc. shareholders											494,312	391,232	365,917
(Loss) earnings from discontinued operations, net of tax	0	508	(34,611)	(331,967)	4,338	21,981	27,565	(4,697)			(366,070)	49,187	306,643
Net loss (earnings) attributable to noncontrolling interests of discontinued operations											319	(9,288)	(45,599)
Net (loss) earnings from discontinued operations attributable to shareholders											(365,751)	39,899	261,044
Net earnings attributable to Match Group, Inc. shareholders	140,579	132,581	66,441	(211,040)	100,425	128,544	113,467	88,695			128,561	431,131	626,961
Numerator: Diluted
Net earnings from continuing operations	140,179	131,487	132,921	149,324	119,934	137,791	119,226	117,682			553,911	494,633	451,104
Net earnings attributable to noncontrolling interests											(59,599)	(103,401)	(85,187)
Impact from subsidiaries' dilutive securities of continuing operations(a)											(9,999)	(25,997)	(24,783)
Net earnings from continuing operations attributable to Match Group, Inc. shareholders											484,313	365,235	341,134
(Loss) earnings from discontinued operations, net of tax	$ 0	$ 508	$ (34,611)	$ (331,967)	$ 4,338	$ 21,981	$ 27,565	$ (4,697)			(366,070)	49,187	306,643
Net loss (earnings) attributable to noncontrolling interests of discontinued operations											319	(9,288)	(45,599)
Impact from subsidiaries’ dilutive securities of discontinued operations(a)											(240)	(67)	(445)
Net (loss) earnings from discontinued operations attributable to shareholders											(365,991)	39,832	260,599
Net earnings attributable to Match Group, Inc. shareholders											$ 118,322	$ 405,067	$ 601,733
Denominator: Basic
Basic weighted average common shares outstanding (shares)											223,433	181,869	180,025
Denominator: Diluted
Basic weighted average common shares outstanding (shares)											223,433	181,869	180,025
Dilutive securities (shares)											19,031	12,480	17,085
Dilutive weighted average common shares outstanding (shares)											242,464	194,349	197,110
Earnings (loss) per share:
Basic - Earnings per share from continuing operations (USD per share)	$ 0.53	$ 0.51	$ 0.56	$ 0.65	$ 0.52	$ 0.60	$ 0.52	$ 0.52			$ 2.21	$ 2.15	$ 2.03
Basic - Loss per share from discontinued operations, net of tax (USD per share)											(1.64)	0.22	1.45
Basic (USD per share)	0.53	0.51	0.36	(1.15)	0.55	0.71	0.62	0.49			0.58	2.37	3.48
Diluted - Earnings per share from continuing operations (USD per share)	0.48	0.45	0.51	0.59	0.46	0.52	0.45	0.45			2.00	1.88	1.73
Diluted - Loss per share from discontinued operations, net of tax (USD per share)											(1.51)	0.20	1.32
Diluted (USD per share)	$ 0.48	$ 0.46	$ 0.32	$ (1.13)	$ 0.48	$ 0.63	$ 0.55	$ 0.42			0.49	2.08	3.05
Match Group
Antidilutive Securities Excluded from Computation of Earnings Per Share
Average share price (in dollars per share)									$ 119.08
Former IAC
Antidilutive Securities Excluded from Computation of Earnings Per Share
Average share price (in dollars per share)										$ 235.09		$ 223.89	$ 167.61
0.875% Exchangeable Senior Notes due October 1, 2022 (the “2022 Exchangeable Notes”); interest payable each April 1 and October 1 | Senior Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Approximate Equivalent Exchange Price per Share											43.99
0.875% Exchangeable Senior Notes due October 1, 2022 (the “2022 Exchangeable Notes”); interest payable each April 1 and October 1 | Senior Notes | Match Group
Antidilutive Securities Excluded from Computation of Earnings Per Share
Approximate Equivalent Exchange Price per Share											43.99
0.875% Exchangeable Senior Notes due October 1, 2022 (the “2022 Exchangeable Notes”); interest payable each April 1 and October 1 | Senior Notes | Former IAC
Antidilutive Securities Excluded from Computation of Earnings Per Share
Approximate Equivalent Exchange Price per Share											152.18
0.875% Exchangeable Senior Notes due June 15, 2026 (the “2026 Exchangeable Notes”); interest payable each June 15 and December 15 | Senior Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Approximate Equivalent Exchange Price per Share											87.52
0.875% Exchangeable Senior Notes due June 15, 2026 (the “2026 Exchangeable Notes”); interest payable each June 15 and December 15 | Senior Notes | Match Group
Antidilutive Securities Excluded from Computation of Earnings Per Share
Approximate Equivalent Exchange Price per Share											87.52
0.875% Exchangeable Senior Notes due June 15, 2026 (the “2026 Exchangeable Notes”); interest payable each June 15 and December 15 | Senior Notes | Former IAC
Antidilutive Securities Excluded from Computation of Earnings Per Share
Approximate Equivalent Exchange Price per Share											302.77
2.00% Exchangeable Senior Notes due January 15, 2030 (the “2030 Exchangeable Notes”); interest payable each January 15 and July 15 | Senior Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share
Approximate Equivalent Exchange Price per Share											84.22
2.00% Exchangeable Senior Notes due January 15, 2030 (the “2030 Exchangeable Notes”); interest payable each January 15 and July 15 | Senior Notes | Match Group
Antidilutive Securities Excluded from Computation of Earnings Per Share
Approximate Equivalent Exchange Price per Share											84.22
2.00% Exchangeable Senior Notes due January 15, 2030 (the “2030 Exchangeable Notes”); interest payable each January 15 and July 15 | Senior Notes | Former IAC
Antidilutive Securities Excluded from Computation of Earnings Per Share
Approximate Equivalent Exchange Price per Share											$ 291.35
Stock options and restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Potentially dilutive securities excluded from the calculation of diluted earnings per share (in shares)											13,400	24,100	7,500
Market based awards and performance based options and units
Antidilutive Securities Excluded from Computation of Earnings Per Share
Potentially dilutive securities excluded from the calculation of diluted earnings per share (in shares)											400	400	200
Exchangeable Notes | Former IAC
Antidilutive Securities Excluded from Computation of Earnings Per Share
Potentially dilutive securities excluded from the calculation of diluted earnings per share (in shares)												2,400	700
Exchangeable Notes | 0.875% Exchangeable Senior Notes due October 1, 2022 (the “2022 Exchangeable Notes”); interest payable each April 1 and October 1 | Former IAC
Antidilutive Securities Excluded from Computation of Earnings Per Share
Potentially dilutive securities excluded from the calculation of diluted earnings per share (in shares)											5,000
Exchangeable Notes | 0.875% Exchangeable Senior Notes due June 15, 2026 (the “2026 Exchangeable Notes”); interest payable each June 15 and December 15 | Former IAC
Antidilutive Securities Excluded from Computation of Earnings Per Share
Potentially dilutive securities excluded from the calculation of diluted earnings per share (in shares)											900
Exchangeable Notes | 2.00% Exchangeable Senior Notes due January 15, 2030 (the “2030 Exchangeable Notes”); interest payable each January 15 and July 15 | Former IAC
Antidilutive Securities Excluded from Computation of Earnings Per Share
Potentially dilutive securities excluded from the calculation of diluted earnings per share (in shares)											1,000