Business Acquisitions - Allocation of Aggregate Purchase Consideration (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 04, 2021	Dec. 31, 2020	Oct. 28, 2020	Dec. 31, 2019	Aug. 21, 2019	Apr. 19, 2019	Apr. 02, 2019
Business Acquisition [Line Items]
Goodwill	$ 1,531,455		$ 1,525,000		$ 1,313,101
Fiscal 2021 Acquisitions
Business Acquisition [Line Items]
Accounts receivable	9,513
Prepaid expenses and other current assets	1,655
Property and equipment	2,188
Operating lease right of use asset	5,888
Deferred tax asset	230
Other long-term assets	62
Goodwill	97,032
Accounts payable and accrued expenses	(5,863)
Deferred revenue	(9,491)
Operating lease liabilities, current	(7,191)
Other current liabilities	(14)
Deferred tax liability	(9,237)
Other long-term liabilities	(1,511)
Total	160,449
Fiscal 2021 Acquisitions | Trade names
Business Acquisition [Line Items]
Finite-lived intangibles	16,349
Fiscal 2021 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles	21,945
Fiscal 2021 Acquisitions | Other purchased intangibles
Business Acquisition [Line Items]
Finite-lived intangibles	38,894
SEOmoz Acquisition
Business Acquisition [Line Items]
Accounts receivable		$ 3,278
Prepaid expenses and other current assets		1,547
Property and equipment		1,845
Operating lease right of use asset		5,888
Other long-term assets		62
Goodwill	$ 41,300	41,329
Accounts payable and accrued expenses		(2,655)
Deferred revenue		(6,398)
Operating lease liabilities, current		(7,191)
Other current liabilities		(14)
Deferred tax liability		(5,327)
Other long-term liabilities		(550)
Total		66,997
SEOmoz Acquisition | Trade names
Business Acquisition [Line Items]
Finite-lived intangibles		7,406
SEOmoz Acquisition | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles		5,000
SEOmoz Acquisition | Other purchased intangibles
Business Acquisition [Line Items]
Finite-lived intangibles		$ 22,777
Fiscal 2020 Acquisitions
Business Acquisition [Line Items]
Accounts receivable			46,138
Prepaid expenses and other current assets			9,105
Property and equipment			2,204
Operating lease right of use asset			10,644
Deferred tax asset			992
Other long-term assets			685
Goodwill			202,901
Accounts payable and accrued expenses			(28,979)
Deferred revenue			(21,918)
Operating lease liabilities, current			(4,520)
Long-term debt			(910)
Operating lease liabilities, noncurrent			(13,104)
Income taxes payable			(3,297)
Liability for uncertain tax positions			(1,576)
Deferred tax liability			(53,870)
Other long-term liabilities			(9,269)
Total			472,760
Fiscal 2020 Acquisitions | Trade names
Business Acquisition [Line Items]
Finite-lived intangibles			66,763
Fiscal 2020 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles			214,347
Fiscal 2020 Acquisitions | Other purchased intangibles
Business Acquisition [Line Items]
Finite-lived intangibles			$ 56,424
RetailMeNot, Inc.
Business Acquisition [Line Items]
Accounts receivable				$ 40,525
Prepaid expenses and other current assets				7,367
Property and equipment				587
Operating lease right of use asset				10,313
Deferred tax asset				605
Other long-term assets				494
Goodwill				169,581
Accounts payable and accrued expenses				(24,526)
Deferred revenue				(11,175)
Operating lease liabilities, current				(4,029)
Operating lease liabilities, noncurrent				(13,085)
Income taxes payable				(3,308)
Liability for uncertain tax positions				(1,576)
Deferred tax liability				(52,504)
Other long-term liabilities				(9,275)
Total				414,384
RetailMeNot, Inc. | Trade names
Business Acquisition [Line Items]
Finite-lived intangibles				62,940
RetailMeNot, Inc. | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles				198,840
RetailMeNot, Inc. | Other purchased intangibles
Business Acquisition [Line Items]
Finite-lived intangibles				$ 42,610
Fiscal 2019 Acquisitions
Business Acquisition [Line Items]
Accounts receivable					22,796
Prepaid expenses and other current assets					4,528
Property and equipment					4,625
Operating lease right of use asset					4,982
Other long-term assets					660
Goodwill					253,096
Accounts payable and accrued expenses					(31,292)
Deferred revenue					(27,953)
Operating lease liabilities, current					(1,768)
Other current liabilities					(516)
Operating lease liabilities, noncurrent					(3,215)
Income taxes payable					(762)
Liability for uncertain tax positions					(170)
Deferred tax liability					(10,229)
Other long-term liabilities					(635)
Total					429,517
Fiscal 2019 Acquisitions | Trade names
Business Acquisition [Line Items]
Finite-lived intangibles					10,773
Fiscal 2019 Acquisitions | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles					123,611
Fiscal 2019 Acquisitions | Other purchased intangibles
Business Acquisition [Line Items]
Finite-lived intangibles					48,446
Fiscal 2019 Acquisitions | Trademarks
Business Acquisition [Line Items]
Finite-lived intangibles					32,540
Highwinds Capital, Inc. and Cloak Holdings, LLC
Business Acquisition [Line Items]
Accounts receivable								$ 900
Prepaid expenses and other current assets								38
Property and equipment								307
Other long-term assets								16
Goodwill					164,100			164,102
Accounts payable and accrued expenses								(19,506)
Deferred revenue								(18,321)
Liability for uncertain tax positions								(170)
Deferred tax liability								(17,552)
Total								209,602
Highwinds Capital, Inc. and Cloak Holdings, LLC | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles								55,260
Highwinds Capital, Inc. and Cloak Holdings, LLC | Other purchased intangibles
Business Acquisition [Line Items]
Finite-lived intangibles								13,110
Highwinds Capital, Inc. and Cloak Holdings, LLC | Trademarks
Business Acquisition [Line Items]
Finite-lived intangibles								24,740
Highwinds Capital, Inc. and Cloak Holdings, LLC | Acquired Technology
Business Acquisition [Line Items]
Finite-lived intangibles								$ 6,678
BabyCenter LLC.
Business Acquisition [Line Items]
Accounts receivable							$ 10,336
Prepaid expenses and other current assets							2,302
Property and equipment							262
Operating lease right of use asset							821
Other long-term assets							110
Goodwill					34,600		34,644
Accounts payable and accrued expenses							(8,627)
Deferred revenue							(544)
Operating lease liabilities, current							(511)
Operating lease liabilities, noncurrent							(310)
Income taxes payable							(61)
Total							71,522
BabyCenter LLC. | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles							14,500
BabyCenter LLC. | Other purchased intangibles
Business Acquisition [Line Items]
Finite-lived intangibles							10,800
BabyCenter LLC. | Trademarks
Business Acquisition [Line Items]
Finite-lived intangibles							$ 7,800
Spiceworks, Inc.
Business Acquisition [Line Items]
Accounts receivable						$ 10,406
Prepaid expenses and other current assets						1,986
Property and equipment						2,388
Operating lease right of use asset						4,161
Deferred tax asset						8,752
Other long-term assets						504
Goodwill					$ 4,100	4,149
Accounts payable and accrued expenses						(2,214)
Deferred revenue						(3,344)
Operating lease liabilities, current						(1,256)
Operating lease liabilities, noncurrent						(2,905)
Income taxes payable						(164)
Total						60,843
Spiceworks, Inc. | Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles						27,200
Spiceworks, Inc. | Other purchased intangibles
Business Acquisition [Line Items]
Finite-lived intangibles						2,600
Spiceworks, Inc. | Trademarks
Business Acquisition [Line Items]
Finite-lived intangibles						5,200
Spiceworks, Inc. | Acquired Technology
Business Acquisition [Line Items]
Finite-lived intangibles						2,700
Spiceworks, Inc. | Noncompete Agreements
Business Acquisition [Line Items]
Finite-lived intangibles						$ 680