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Acquisitions - Additional Information (Detail) |  |  |  |  |  |  |  | 3 Months Ended | 4 Months Ended | 7 Months Ended | 8 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 26, 2021 USD ($) | Sep. 30, 2021 USD ($) shares | Jul. 16, 2021 USD ($) shares | Jun. 17, 2021 USD ($) shares | May 25, 2021 USD ($) shares | Apr. 29, 2021 USD ($) | Mar. 02, 2021 USD ($) | Dec. 31, 2021 USD ($) shares | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2021 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Jul. 31, 2021 € / shares | Mar. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of contingent consideration | [1] |  |  |  |  |  |  |  | $ 18,200,000 |  | $ 4,662,000 |  |  |  | $ 40,287,000 | $ 15,419,000 |  |
Acquisition purchase price liabilities | [2] |  |  |  |  |  |  |  | 253,700,000 |  |  |  | $ 253,700,000 | $ 253,700,000 | 253,700,000 |  |  | $ 0
Fyber |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  | 95.10% |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire business |  |  |  |  |  | $ 124,336,000 |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |
Business acquisition, stock issued (in shares) | shares |  |  | 18,000 | 1,040,364 | 1,500,000 | 3,216,935 |  |  |  |  |  | 5,775,299 |  |  |  |  |  |
Business acquisition, value of stock issued |  |  |  | $ 64,253,000 | $ 92,640,000 | $ 198,678,000 |  |  |  |  |  | $ 359,233,000 |  |  |  |  |  |
Contingent consideration, revenue threshold, minimum |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Estimated contingent consideration, maximum |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, stock reduction (in shares) | shares |  |  | 41,289 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  | $ 31,000,000 |  |  |  |  |  | 49,200,000 | $ 31,000,000 |  | $ 31,000,000 | 49,200,000 | 49,200,000 | 49,200,000 |  |  |
Additional equity interest purchased |  |  |  |  |  |  |  |  |  | $ 21,000,000 |  |  |  |  |  |  |  |
Cumulative voting interest acquired |  |  | 99.40% |  |  |  |  |  |  | 99.40% |  | 99.40% |  |  |  |  |  |
Goodwill adjustment |  |  |  |  |  |  |  |  |  |  |  |  | (4,104,000) |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  | $ 5,183,000 |  |  |  |  |  | 16,898,000 |  |  |
Fyber | Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, stock issued (in shares) | shares |  |  |  |  |  |  |  |  | 59,289 |  |  | 5,816,588 |  |  |  |  |  |
Business acquisition, value of stock issued |  |  |  |  |  |  |  |  | $ 3,662,000 |  |  |  |  |  |  |  |  |
Fyber | Minority Fyber Shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, per share price (in EUR per share) | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 0.84 |
Fyber | Publisher relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |
Fyber | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Fyber | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Fyber | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
AdColony |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire business |  | $ 98,175,000 |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Estimated contingent consideration, maximum |  |  |  |  |  |  | $ 225,000,000 |  |  |  |  |  |  |  |  |  |  |
Acquisition purchase price liabilities, unpaid cash consideration, payment term |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  |  |  | 204,500,000 |  |  |  | $ 204,500,000 | 204,500,000 | 204,500,000 |  |  |
Change in fair value of contingent consideration |  |  |  |  |  |  |  |  |  | $ (8,913,000) |  |  |  |  |  |  |  |
Goodwill adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (3,502,000) |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  | $ 486,000 |  |  |  |  |  | $ 3,977,000 |  |  |
Acquisition purchase price liabilities, unpaid cash consideration |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Estimated contingent consideration, minimum |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |
AdColony | Publisher relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
AdColony | Developed technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
AdColony | Trade names |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
AdColony | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |
AdColony | Minimum | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 8 years |  |  |  |  |  |  |  |  |  |  |
AdColony | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  | $ 425,000,000 |  |  |  |  |  |  |  |  |  |  |
AdColony | Maximum | Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, useful life |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Appreciate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration |  |  |  |  |  |  |  | $ 20,003,000 |  |  |  |  |  |  |  |  |  |
Business combination, retention bonus liability recognized |  |  |  |  |  |  |  | 6,000,000,000 |  |  |  |  |  |  |  |  |  |
Goodwill, tax deductible |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
[1] | In the fiscal quarter ended June 30, 2021, the Company initiated two significant acquisitions. Please refer to Note 4 in the accompanying condensed consolidated financial statements.
[2] | In the fiscal quarter ended June 30, 2021, the Company initiated two significant acquisitions. Please refer to Note 4 in the accompanying condensed consolidated financial statements.

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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