Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerators:
Net income	$ 49,068	$ 35,846	$ 100,399	$ 72,024
Denominators:
Basic weighted average common shares outstanding (in shares)	33,355,354	33,403,411	33,397,226	33,422,618
Dilutive effect of share-based awards (in shares)	333,095	427,128	412,329	439,979
Diluted weighted average common shares outstanding (in shares)	33,688,449	33,830,539	33,809,555	33,862,597
Earnings per share attributable to ExlService Holdings, Inc. stockholders:
Basic (in dollars per share)	$ 1.47	$ 1.07	$ 3.01	$ 2.15
Diluted (in dollars per share)	$ 1.46	$ 1.06	$ 2.97	$ 2.13
Weighted average potentially dilutive considered anti-dilutive and not included in computing diluted earnings per share (in shares)	249,831		179,550	541