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SEGMENT INFORMATION (Reconciliation of Segment Operating Profit to Consolidated Income Before Provision for Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Segment Reconciliation [Abstract] |  |  |
Number Of Reportable Segments, Not Disclosed, Flag | reportable segments |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment revenues | $ 5,457,056 | $ 4,727,940 | $ 4,690,540
Cost of revenues (exclusive of depreciation and amortization) | 3,883,535 | 3,277,497 | 3,256,514
Selling, general and administrative expenses | 928,707 | 816,300 | 815,065
Depreciation and amortization expense | 124,811 | 89,559 | 91,800
Stock-based compensation expense | (176,764) | (167,297) | (147,730)
Amortization of purchased intangibles | (71,367) | (29,475) | (22,717)
Loss on sale of business | 0 | 0 | (25,922)
Income from operations | 520,003 | 544,584 | 501,239
Interest and other income, net | 11,546 | 46,876 | 51,124
Foreign exchange loss | (25,925) | (7,048) | (15,778)
Income before provision for income taxes | 505,624 | 584,412 | 536,585
Operating Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment revenues | 5,457,056 | 4,727,940 | 4,690,540
Cost of revenues (exclusive of depreciation and amortization) | 3,814,387 | 3,206,168 | 3,215,431
Selling, general and administrative expenses | 734,157 | 636,087 | 649,842
Depreciation and amortization expense | 53,444 | 60,085 | 69,083
Segment operating profit (loss): | 855,068 | 825,600 | 756,184
Unallocated Amounts |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Stock-based compensation expense | (176,764) | (167,297) | (147,730)
Amortization of purchased intangibles | (71,367) | (29,475) | (22,717)
Other acquisition-related expenses | (1,345) | $ (15,472) | (2,768)
Business Combination, Separately Recognized Transaction, Acquisition-Related Cost, Expensed, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Income from operations |
Loss on sale of business |  |  | (25,922)
Other unallocated costs | (85,589) | $ (68,772) | (55,808)
Income from operations | 520,003 | 544,584 | 501,239
Americas | Operating Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment revenues | 3,166,116 | 2,866,339 | 2,765,022
Cost of revenues (exclusive of depreciation and amortization) | 2,189,329 | 1,915,851 | 1,848,758
Selling, general and administrative expenses | 418,715 | 369,055 | 361,589
Depreciation and amortization expense | 35,957 | 40,009 | 43,645
Segment operating profit (loss): | 522,115 | 541,424 | 511,030
Europe | Operating Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment revenues | 2,290,940 | 1,861,601 | 1,909,443
Cost of revenues (exclusive of depreciation and amortization) | 1,625,058 | 1,290,317 | 1,348,190
Selling, general and administrative expenses | 315,442 | 267,032 | 285,722
Depreciation and amortization expense | 17,487 | 20,076 | 25,307
Segment operating profit (loss): | $ 332,953 | $ 284,176 | 250,224
Russia | Operating Segments |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Segment revenues |  |  | 16,075
Cost of revenues (exclusive of depreciation and amortization) |  |  | 18,483
Selling, general and administrative expenses |  |  | 2,531
Depreciation and amortization expense |  |  | 131
Segment operating profit (loss): |  |  | $ (5,070)

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