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Business Acquisitions - Supplementary Information on Unaudited Pro Forma Financial Basis (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Fiscal 2022 Acquisitions |  |
Revenues | $ 1,407,300 | $ 1,461,178
Net income from continuing operations | $ 64,877 | $ 398,201
Income per common share from continuing operations - Basic (in dollars per share) | $ 1.38 | $ 8.67
Income per common share from continuing operations - Diluted (in dollars per share) | $ 1.38 | $ 8.31
Fiscal 2021 Acquisitions |  |
Revenues |  | $ 1,482,323
Net income from continuing operations |  | $ 416,348
Income per common share from continuing operations - Basic (in dollars per share) |  | $ 9.06
Income per common share from continuing operations - Diluted (in dollars per share) |  | $ 8.69
SEOmoz Acquisition |  |
Revenues |  | $ 1,438,099
Net income from continuing operations |  | $ 406,281
Income per common share from continuing operations - Basic (in dollars per share) |  | $ 8.84
Income per common share from continuing operations - Diluted (in dollars per share) |  | $ 8.48

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