v3.25.4
Operating Segments and Geographic Information - Summary of Revenues and Significant Expenses by Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 3,542,642 $ 3,566,324 $ 3,900,125
Compensation and benefits 1,931,473 2,040,382 2,277,899
Reimbursable expenses 544,996 521,757 486,639
Other segment items 822,170 821,509 895,533
Impairment of goodwill and indefinite-lived asset 203,685 275,170 43,500
Depreciation and amortization 202,258 204,553 208,856
Income from investment in European joint venture and other (7,491) (2,064) (5,210)
Deconsolidation of European joint venture     (58,891)
(Gain) loss on divestitures (27,983)    
Total operating expenses 3,669,108 3,861,307 3,853,536
Operating (loss) income from continuing operations (126,466) (294,983) 46,589
Branded Services [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,163,672 1,306,336 1,758,417
Compensation and benefits 644,587 719,089 1,009,334
Reimbursable expenses 133,287 171,766 179,029
Other segment items 281,920 330,736 417,320
Impairment of goodwill and indefinite-lived asset 77,797 275,170 43,500
Depreciation and amortization 125,807 130,212 140,932
Income from investment in European joint venture and other (7,491) (2,064)  
Deconsolidation of European joint venture     (58,891)
(Gain) loss on divestitures (27,983)    
Total operating expenses 1,227,924 1,624,909 1,731,224
Operating (loss) income from continuing operations (64,252) (318,573) 27,193
Experiential Services [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,435,297 1,295,029 1,159,449
Compensation and benefits 696,910 701,906 638,081
Reimbursable expenses 411,709 349,991 307,610
Other segment items 248,046 201,149 173,879
Impairment of goodwill and indefinite-lived asset 53,086    
Depreciation and amortization 42,751 41,728 36,584
Total operating expenses 1,452,502 1,294,774 1,156,154
Operating (loss) income from continuing operations (17,205) 255 3,295
Retailer Services [Member]      
Segment Reporting Information [Line Items]      
Revenues 943,673 964,959 982,259
Compensation and benefits 589,976 619,387 630,484
Other segment items 292,204 289,624 304,334
Impairment of goodwill and indefinite-lived asset 72,802    
Depreciation and amortization 33,700 32,613 31,340
Total operating expenses 988,682 941,624 966,158
Operating (loss) income from continuing operations $ (45,009) $ 23,335 $ 16,101