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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
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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 |  |

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