Business Acquisitions - Supplementary Information on Unaudited Pro Forma Financial Basis (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
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

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-SubTopic 10
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-SubTopic 10
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479328/805-10-50-2

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