Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Numerators:
Net income	$ 36,178	$ 31,931
Denominators:
Basic weighted average common shares outstanding (in shares)	33,442,038	33,734,118
Dilutive effect of share based awards (in shares)	452,830	342,993
Dilutive effect of conversion premium on the Notes (in shares)	0	241,207
Diluted weighted average common shares outstanding (in shares)	33,894,868	34,318,318
Earnings per share attributable to ExlService Holdings Inc. stockholders:
Basic (in dollars per share)	$ 1.08	$ 0.95
Diluted (in dollars per share)	$ 1.07	$ 0.93
Weighted average potentially dilutive considered anti-dilutive and not included in computing diluted earnings per share (in shares)	1,082	0