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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) subsidiary | Dec. 31, 2024 USD ($) subsidiary | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Nov. 15, 2019
Loss from discontinued operations, net of tax |  | $ 0 | $ 0 | $ 1,709 |  |
Depreciation and amortization |  | 211,916 | 236,966 | 233,400 |  |
General and administrative expense |  | $ 203,461 | 195,726 | 181,871 |  |
Number of operating segments | subsidiary | 5 |  |  |  |  |
Number of reportable segments | subsidiary | 5 | 5 |  |  |  |
Goodwill impairment |  | $ 85,273 | 56,850 | 27,369 |  |
Stockholders' equity attributable to parent | $ 1,810,882 | 1,810,882 | 1,892,998 | 1,892,611 | $ 1,967,732 |
Net deferred tax liabilities | (46,018) | (46,018) | (45,503) |  |  |
Direct costs |  | 200,323 | 185,650 | 184,546 |  |
Research, development, and engineering |  | 67,373 | 68,860 | 74,093 |  |
Advertising costs incurred |  | 114,800 | 120,800 | 128,800 |  |
Foreign currency translation adjustment |  | (12,426) | 13,657 | (32,479) |  |
Foreign exchange realized gains (losses) |  | (1,000) | (3,900) | 8,200 |  |
Revision of Prior Period, Reclassification, Adjustment | Direct costs |  |  |  |  |  |
Depreciation and amortization |  |  | (11,600) | (11,000) |  |
Revision of Prior Period, Reclassification, Adjustment | General, administrative, and other related costs |  |  |  |  |  |
Depreciation and amortization |  |  | (225,300) | (222,400) |  |
Retained earnings |  |  |  |  |  |
Stockholders' equity attributable to parent | 1,401,034 | 1,401,034 | 1,491,956 | 1,537,830 | 1,515,358 |
Additional paid-in capital |  |  |  |  |  |
Stockholders' equity attributable to parent | $ 491,891 | $ 491,891 | $ 472,201 | 439,681 | 509,122 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Stockholders' equity attributable to parent |  |  |  |  | (64,701) |
Net deferred tax liabilities |  |  |  | 21,200 |  |
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings |  |  |  |  |  |
Stockholders' equity attributable to parent |  |  |  | 23,400 | 23,436 |
Cumulative Effect, Period of Adoption, Adjustment | Additional paid-in capital |  |  |  |  |  |
Stockholders' equity attributable to parent |  |  |  | (88,100) | $ (88,137) |
Minimum | Trade names and trademarks |  |  |  |  |  |
Useful life | 2 years | 2 years |  |  |  |
Minimum | Customer relationships |  |  |  |  |  |
Useful life | 3 years | 3 years |  |  |  |
Minimum | Other intangibles |  |  |  |  |  |
Useful life | 1 year | 1 year |  |  |  |
Maximum | Trade names and trademarks |  |  |  |  |  |
Useful life | 20 years | 20 years |  |  |  |
Maximum | Customer relationships |  |  |  |  |  |
Useful life | 16 years | 16 years |  |  |  |
Maximum | Other intangibles |  |  |  |  |  |
Useful life | 10 years | 10 years |  |  |  |
Equipment | Minimum |  |  |  |  |  |
Estimated useful lives of property and equipment | 1 year | 1 year |  |  |  |
Equipment | Maximum |  |  |  |  |  |
Estimated useful lives of property and equipment | 10 years | 10 years |  |  |  |
Software and Software Development Costs |  |  |  |  |  |
Estimated useful lives of property and equipment | 3 years | 3 years |  |  |  |
1.75% Convertible Notes | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Convertible notes, increase in carrying amount |  |  |  | $ 85,900 |  |
1.75% Convertible Notes | Convertible Debt |  |  |  |  |  |
Stated interest rate |  |  |  | 1.75% |  | 1.75%
1.75% Convertible Notes | Convertible Debt | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Stated interest rate |  |  |  | 1.75% |  |

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