Business combination holdback consideration payable.

No definition available.

Name:	adv_BusinessCombinationHoldbackConsiderationPayable
Namespace Prefix:	adv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash paid.

+ References

No definition available.

+ Details

Name:	adv_CashPaid
Namespace Prefix:	adv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Loss on acquired liabilities remaining.

+ References

No definition available.

+ Details

Name:	adv_LossOnAcquiredLiabilitiesRemaining
Namespace Prefix:	adv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period of settlement of holdback consideration.

+ References

No definition available.

+ Details

Name:	adv_PeriodOfSettlementOfHoldbackConsideration
Namespace Prefix:	adv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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
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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)
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-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

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ 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 (c)(3)
-URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

Name:	us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGainOrLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

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- Details

Name:	adv_BusinessAcquistionNatureOfBusinessAxis=adv_SalesAgenciesMember
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Period Type:

- Details

Name:	adv_BusinessAcquistionNatureOfBusinessAxis=adv_MarketingAgenciesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=adv_AcquisitionsInTwoAndNineteenMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=adv_AcquisitionsInTwoThousandAndEighteenMember
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Acquisitions -Additional Information (Detail) $ in Thousands	12 Months Ended
	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