Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) $ / shares in Units, $ in Thousands			1 Months Ended	3 Months Ended		6 Months Ended
		Jun. 20, 2023	Aug. 31, 2023	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares	Jun. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2023 USD ($) $ / shares shares
Numerators:
Net income | $				$ 45,825	$ 49,068	$ 94,588	$ 100,399
Denominators:
Basic weighted average common shares outstanding (in shares)	[1]			162,794,138	166,776,770	163,938,263	166,986,130
Dilutive effect of share-based awards (in shares)				1,167,616	1,665,475	1,406,041	2,061,645
Diluted weighted average common shares outstanding (in shares)	[1]			163,961,754	168,442,245	165,344,304	169,047,775
Earnings per share attributable to ExlService Holdings, Inc. stockholders:
Basic (in dollars per share) | $ / shares	[1]			$ 0.28	$ 0.29	$ 0.58	$ 0.60
Diluted (in dollars per share) | $ / shares	[1]			$ 0.28	$ 0.29	$ 0.57	$ 0.59
Weighted average potentially dilutive considered anti-dilutive and not included in computing diluted earnings per share (in shares)				3,314,536	1,249,155	3,247,920	897,750
Stock split conversion ratio		5	5

[1] Prior period information has been adjusted to reflect the 5-for-1 forward stock split of the Company’s common stock effected in August 2023. Refer to Note 19 – Capital Structure to the unaudited consolidated financial statements for further details.