Goodwill and Intangible Assets - Finite Lived Intangibles Acquired (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	9 years 8 months 12 days	10 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	8 years 1 month 6 days	8 years
Other purchased intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	9 years 3 months 18 days	9 years 8 months 12 days
SEOmoz Acquisition
Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 35,183
SEOmoz Acquisition | Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	5 years
Fair Value	$ 7,406
SEOmoz Acquisition | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	5 years 2 months 12 days
Fair Value	$ 5,000
SEOmoz Acquisition | Other purchased intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	5 years
Fair Value	$ 22,777
Fiscal 2020 Acquisitions
Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 42,005
Fiscal 2020 Acquisitions | Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	3 years 8 months 12 days
Fair Value	$ 8,943
Fiscal 2020 Acquisitions | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	6 years 9 months 18 days
Fair Value	$ 16,945
Fiscal 2020 Acquisitions | Other purchased intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted-Average   Amortization Period	3 years 7 months 6 days
Fair Value	$ 16,117