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v3.25.4

REVENUES (Schedule of Disaggregation of Revenues) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 USD ($) market | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Revenue from Contract with Customer [Abstract] |  |  |
Number of geographic markets | market | 3 |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 5,457,056 | $ 4,727,940 | $ 4,690,540
Revenues from performance obligations satisfied in previous period | 23,300 | 13,600 | 5,800
Time-and-materials |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,364,413 | 3,900,952 | 4,082,503
Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,063,210 | 797,231 | 579,230
Licensing and other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 29,433 | 29,757 | 28,807
Financial Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,316,487 | 1,022,617 | 1,018,433
Consumer Goods, Retail & Travel |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,077,513 | 1,013,138 | 1,072,950
Software & Hi-Tech |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 821,819 | 702,367 | 707,720
Business Information & Media |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 675,667 | 674,597 | 753,981
Life Sciences & Healthcare |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 625,607 | 574,605 | 489,914
Emerging Verticals |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 939,963 | 740,616 | 647,542
Americas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,166,116 | 2,866,339 | 2,765,022
Americas | Time-and-materials |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,608,351 | 2,423,554 | 2,457,545
Americas | Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 534,046 | 419,361 | 283,183
Americas | Licensing and other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 23,719 | 23,424 | 24,294
Americas | Financial Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 603,711 | 519,986 | 538,837
Americas | Consumer Goods, Retail & Travel |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 479,934 | 450,162 | 472,350
Americas | Software & Hi-Tech |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 560,449 | 525,091 | 552,492
Americas | Business Information & Media |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 465,232 | 449,449 | 429,800
Americas | Life Sciences & Healthcare |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 496,831 | 488,455 | 429,245
Americas | Emerging Verticals |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 559,959 | 433,196 | 342,298
Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,290,940 | 1,861,601 | 1,909,443
Europe | Time-and-materials |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,756,062 | 1,477,398 | 1,613,790
Europe | Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 529,164 | 377,870 | 291,174
Europe | Licensing and other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5,714 | 6,333 | 4,479
Europe | Financial Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 712,776 | 502,631 | 472,146
Europe | Consumer Goods, Retail & Travel |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 597,579 | 562,976 | 596,830
Europe | Software & Hi-Tech |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 261,370 | 177,276 | 153,683
Europe | Business Information & Media |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 210,435 | 225,148 | 323,985
Europe | Life Sciences & Healthcare |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 128,776 | 86,150 | 60,549
Europe | Emerging Verticals |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 380,004 | 307,420 | 302,250
Russia |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 16,075
Russia | Time-and-materials |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 11,168
Russia | Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 4,873
Russia | Licensing and other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 34
Russia | Financial Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 7,450
Russia | Consumer Goods, Retail & Travel |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 3,770
Russia | Software & Hi-Tech |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 1,545
Russia | Business Information & Media |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 196
Russia | Life Sciences & Healthcare |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 120
Russia | Emerging Verticals |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 2,994
Americas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,200,924 | 2,834,704 | 2,742,662
Americas | Americas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,011,650 | 2,726,757 | 2,645,174
Americas | Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 189,274 | 107,947 | 96,857
Americas | Russia |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 631
EMEA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,147,304 | 1,793,198 | 1,822,782
EMEA | Americas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 152,558 | 137,370 | 116,054
EMEA | Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,994,746 | 1,655,828 | 1,706,728
EMEA | Russia |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 0
APAC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 108,828 | 100,038 | 102,138
APAC | Americas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,908 | 2,212 | 3,248
APAC | Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 106,920 | $ 97,826 | 98,890
APAC | Russia |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 0
CEE |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 22,958
CEE | Americas |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 546
CEE | Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | 6,968
CEE | Russia |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  |  | $ 15,444

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