v3.26.1
Restatement of Previously Issued Consolidated Financial Statements - Restated Consolidated Statements of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue $ 8,251,340 $ 8,188,990 $ 8,054,926
Costs and expenses:      
Direct costs 6,075,746 5,818,061 5,706,187
Selling, general and administrative 780,139 728,348 768,559
Depreciation and amortization 382,996 488,500 585,950
Transaction and integration related 25,269 29,574 44,176
Restructuring charges 79,069 92,123 45,390
Total costs and expenses 7,808,494 7,156,606 7,150,262
Income from operations 442,846 1,032,384 904,664
Interest income 7,109 8,609 5,014
Interest expense (197,490) (237,237) (336,699)
Income before income tax expense 252,465 803,756 572,979
Income tax expense (23,126) (64,630) (18,388)
Income before share of losses from equity method investments 229,339 739,126 554,591
Loss on equity method investments 0 0 383
Net income $ 229,339 $ 739,126 $ 554,208
Net income per ordinary share:      
Basic (USD per share) $ 2.92 $ 8.96 $ 6.75
Diluted (USD per share) $ 2.90 $ 8.90 $ 6.70
Weighted average number of ordinary shares outstanding:      
Basic (in shares) 78,423,675 82,482,764 82,101,813
Diluted (in shares) 78,965,385 83,032,424 82,717,640
As Reported      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   $ 8,281,676 $ 8,120,176
Costs and expenses:      
Direct costs   5,845,319 5,719,949
Selling, general and administrative   728,348 768,559
Depreciation and amortization   488,500 585,950
Transaction and integration related   29,574 44,176
Restructuring charges   92,123 45,390
Total costs and expenses   7,183,864 7,164,024
Income from operations   1,097,812 956,152
Interest income   8,609 5,014
Interest expense   (237,237) (336,699)
Income before income tax expense   869,184 624,467
Income tax expense   (77,710) (11,749)
Income before share of losses from equity method investments   791,474 612,718
Loss on equity method investments   0 383
Net income   $ 791,474 $ 612,335
Net income per ordinary share:      
Basic (USD per share)   $ 9.60 $ 7.46
Diluted (USD per share)   $ 9.53 $ 7.40
Weighted average number of ordinary shares outstanding:      
Basic (in shares)   82,482,764 82,101,813
Diluted (in shares)   83,032,424 82,717,640
Adjustments      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Revenue   $ (92,686) $ (65,250)
Costs and expenses:      
Direct costs   (27,258) (13,762)
Selling, general and administrative   0 0
Depreciation and amortization   0 0
Transaction and integration related   0 0
Restructuring charges   0 0
Total costs and expenses   (27,258) (13,762)
Income from operations   (65,428) (51,488)
Interest income   0 0
Interest expense   0 0
Income before income tax expense   (65,428) (51,488)
Income tax expense   13,080 (6,639)
Income before share of losses from equity method investments   (52,348) (58,127)
Loss on equity method investments   0 0
Net income   $ (52,348) $ (58,127)
Net income per ordinary share:      
Basic (USD per share)  
Diluted (USD per share)  
Weighted average number of ordinary shares outstanding:      
Basic (in shares)  
Diluted (in shares)