Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenues, net		$ 245,990	$ 239,573
Cost of revenues	[1]	162,656	157,240
Gross profit	[1]	83,334	82,333
Operating expenses:
General and administrative expenses		28,941	32,531
Selling and marketing expenses		14,456	18,047
Depreciation and amortization expense		12,450	13,667
Impairment and restructuring charges		0	1,227
Total operating expenses		55,847	65,472
Income from operations		27,487	16,861
Foreign exchange gain, net		1,377	1,260
Interest expense		(3,072)	(3,582)
Other income, net		2,529	4,423
Income before income tax expense and earnings from equity affiliates		28,321	18,962
Income tax expense		5,855	4,200
Income before earnings from equity affiliates		22,466	14,762
Loss from equity-method investment		55	67
Net income attributable to ExlService Holdings, Inc. stockholders		$ 22,411	$ 14,695
Earnings per share attributable to ExlService Holdings, Inc. stockholders:
Basic (in dollars per share)		$ 0.65	$ 0.43
Diluted (in dollars per share)		$ 0.65	$ 0.42
Weighted-average number of shares used in computing earnings per share attributable to ExlService Holdings Inc. stockholders:
Basic (in shares)		34,401,565	34,374,815
Diluted (in shares)		34,720,603	34,833,435

[1] Exclusive of depreciation and amortization expense.