CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 503,376	$ 558,123
Cost of revenue:
Traffic acquisition costs	(297,364)	(322,429)
Other cost of revenue	(33,806)	(26,045)
Gross profit	172,206	209,649
Operating expenses:
Research and development expenses	(37,515)	(46,577)
Sales and operations expenses	(84,974)	(95,909)
General and administrative expenses	(25,915)	(33,770)
Total operating expenses	(148,404)	(176,256)
Income from operations	23,802	33,393
Financial income (expense)	(334)	(1,974)
Income before taxes	23,468	31,419
Provision for income taxes	(7,040)	(10,018)
Net income	16,428	21,401
Net income available to shareholders of Criteo S.A.	15,459	19,120
Net income available to non-controlling interests	$ 969	$ 2,281
Net income allocated to shareholders of Criteo S.A. per share:
Basic (in USD per share)	$ 0.25	$ 0.30
Diluted (in USD per share)	$ 0.25	$ 0.29
Weighted average shares outstanding used in computing per share amounts:
Basic (in shares)	61,691,001	64,336,777
Diluted (in shares)	62,125,582	66,041,296