Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues, net		$ 222,473	$ 243,509	$ 468,463	$ 483,082
Cost of revenues	[1]	158,401	162,446	321,057	319,686
Gross profit	[1]	64,072	81,063	147,406	163,396
Operating expenses:
General and administrative expenses		28,750	31,228	57,691	63,759
Selling and marketing expenses		13,051	17,647	27,507	35,694
Depreciation and amortization expense		12,405	12,752	24,855	26,419
Impairment and restructuring charges		0	5,580	0	6,807
Total operating expenses		54,206	67,207	110,053	132,679
Income from operations		9,866	13,856	37,353	30,717
Foreign exchange gain, net		1,359	1,202	2,736	2,462
Interest expense		(2,883)	(3,864)	(5,955)	(7,446)
Other income, net		4,225	4,102	6,754	8,525
Income before income tax expense and earnings from equity affiliates		12,567	15,296	40,888	34,258
Income tax expense		4,072	2,670	9,927	6,870
Income before earnings from equity affiliates		8,495	12,626	30,961	27,388
Loss from equity-method investment		66	62	121	129
Net income attributable to ExlService Holdings, Inc. stockholders		$ 8,429	$ 12,564	$ 30,840	$ 27,259
Earnings per share attributable to ExlService Holdings, Inc. stockholders:
Basic (in dollars per share)		$ 0.24	$ 0.36	$ 0.90	$ 0.79
Diluted (in dollars per share)		$ 0.24	$ 0.36	$ 0.89	$ 0.78
Weighted-average number of shares used in computing earnings per share attributable to ExlService Holdings Inc. stockholders:
Basic (in shares)		34,486,202	34,451,671	34,443,884	34,413,455
Diluted (in shares)		34,597,688	34,702,547	34,659,146	34,768,203

[1] Exclusive of depreciation and amortization expense.