Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues, net		$ 239,573	$ 206,973
Cost of revenues	[1]	157,240	138,101
Gross profit	[1]	82,333	68,872
Operating expenses:
General and administrative expenses		32,531	29,266
Selling and marketing expenses		18,047	13,952
Depreciation and amortization		13,667	10,504
Impairment charges		1,227	0
Total operating expenses		65,472	53,722
Income from operations		16,861	15,150
Foreign exchange gain, net		1,260	615
Interest expense		(3,582)	(538)
Other income, net		4,423	3,534
Income before income tax expense/(benefit) and earnings from equity affiliates		18,962	18,761
Income tax expense/(benefit)		4,200	(4,453)
Income before earnings from equity affiliates		14,762	23,214
Loss from equity-method investment		67	56
Net income attributable to ExlService Holdings, Inc. stockholders		$ 14,695	$ 23,158
Earnings per share attributable to ExlService Holdings, Inc. stockholders:
Basic (in dollars per share)		$ 0.43	$ 0.67
Diluted (in dollars per share)		$ 0.42	$ 0.66
Weighted-average number of shares used in computing earnings per share attributable to ExlService Holdings, Inc. stockholders:
Basic (in shares)		34,374,815	34,446,265
Diluted (in shares)		34,833,435	35,302,926

[1] Exclusive of depreciation and amortization.