Earnings Per Share - Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to shareholders of Criteo S.A.	$ 82,272	$ 59,553	$ 45,556
Weighted average shares outstanding, basic (in shares)	63,337,792	61,835,499	58,928,563
Dilutive effect of :
Restricted share awards (in shares)	253,728	0	0
Share options and BSPCE (in shares)	1,958,728	3,133,549	4,347,236
Share warrants (in shares)	83,222	127,438	217,461
Weighted average number of shares outstanding used to determine diluted earnings per share (in shares)	65,633,470	65,096,486	63,493,260
Diluted earnings per share (in dollars per share)	$ 1.25	$ 0.91	$ 0.72