CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 437,614	$ 528,147	$ 940,990	$ 1,086,270
Cost of revenue:
Traffic acquisition costs	(257,698)	(304,229)	(555,062)	(626,658)
Other cost of revenue	(33,914)	(29,059)	(67,720)	(55,104)
Gross profit	146,002	194,859	318,208	404,508
Operating expenses:
Research and development expenses	(31,247)	(44,015)	(68,762)	(90,592)
Sales and operations expenses	(75,781)	(95,503)	(160,755)	(191,412)
General and administrative expenses	(29,185)	(35,767)	(55,100)	(69,537)
Total operating expenses	(136,213)	(175,285)	(284,617)	(351,541)
Income from operations	9,789	19,574	33,591	52,967
Financial income (expense)	(1,003)	(1,354)	(1,337)	(3,328)
Income before taxes	8,786	18,220	32,254	49,639
Provision for income taxes	(2,636)	(5,683)	(9,676)	(15,701)
Net income	6,150	12,537	22,578	33,938
Net income available to shareholders of Criteo S.A.	5,716	10,823	21,175	29,943
Net income available to non-controlling interests	$ 434	$ 1,714	$ 1,403	$ 3,995
Net income allocated to shareholders of Criteo S.A. per share:
Basic (in USD per share)	$ 0.09	$ 0.17	$ 0.34	$ 0.46
Diluted (in USD per share)	$ 0.09	$ 0.16	$ 0.34	$ 0.45
Weighted average shares outstanding used in computing per share amounts:
Basic (in shares)	61,415,467	64,581,476	61,553,875	64,459,867
Diluted (in shares)	61,790,135	65,624,505	61,958,499	65,833,642