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Acquisitions -Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Businesses | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Number of acquired businesses | Business | Businesses | 2 |  |
Cash paid for business acquisition | $ 17,000 |  |
Contingent consideration | 45,901 | $ 47,649 | $ 85,977
Business combination holdback consideration payable | 1,400 |  |
Business acquisition, maximum contingent consideration | $ 286,200 |  |
Acquisitions In 2020 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of acquired businesses | Business | Businesses | 5 |  |
Purchase price | $ 88,100 |  |
Cash paid for business acquisition | 68,000 |  |
Contingent consideration | 14,800 |  |
Business combination holdback consideration payable | 5,300 |  |
Business acquisition, maximum contingent consideration | $ 53,000 |  |
Period of settlement of holdback consideration | 24 months |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 26,700 |  |
Bsuiness combination revenue of the acquiree since acquisition date | 64,300 |  |
Business combination transaction costs incurred and recognised in the income statement | $ 200 |  |
Acquisitions In 2020 [Member] | Sales Agencies [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of acquired businesses | Business | Businesses | 3 |  |
Acquisitions In 2020 [Member] | Marketing Agencies [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of acquired businesses | Business | Businesses | 2 |  |
Acquisitions In 2019 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of acquired businesses | Business | Businesses | 4 |  |
Purchase price |  | 14,000 |
Cash paid for business acquisition |  | 10,600 |
Contingent consideration |  | 2,500 |
Business combination holdback consideration payable |  | 900 |
Business acquisition, maximum contingent consideration |  | $ 10,700 |
Period of settlement of holdback consideration |  | 24 months |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  | $ 300 |
Business Acquisition, Current Revenues of Acquiree |  | 17,300 |
Business Acquisition, transaction costs incurred |  | $ 400 |
Acquisitions In 2019 [Member] | Sales Agencies [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of acquired businesses | Business | Businesses | 2 |  |
Acquisitions In 2019 [Member] | Marketing Agencies [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of acquired businesses | Business | Businesses | 2 |  |
Acquisitions In 2018 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of acquired businesses | Business | Businesses | 4 |  |
Purchase price |  |  | 129,800
Cash paid for business acquisition |  |  | 109,800
Contingent consideration |  |  | 18,700
Business combination holdback consideration payable | $ 1,400 |  |
Business acquisition, maximum contingent consideration |  |  | 127,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | 45,100
Business Acquisition, Current Revenues of Acquiree |  |  | 29,600
Business Acquisition, transaction costs incurred |  |  | 2,100
Acquisitions In 2018 [Member] | Marketing Agencies [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of acquired businesses | Business | Businesses | 5 |  |
Take Five [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price |  |  | 81,600
Contingent consideration |  |  | 4,600
Business combination holdback consideration payable |  |  | 800
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net |  |  | 79,200
Cash Paid |  |  | 76,200
Loss On Acquired Liabilities Remaining |  |  | $ 3,000

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- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 + Details
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- Definition Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition. + References No definition available. + 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=116868678&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + 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 (c)(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 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before 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 (g)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + 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=121586364&loc=d3e3213-108585 + Details
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