XML 69 R58.htm IDEA: XBRL DOCUMENT
v3.20.2

Acquisitions - Additional Information (Detail) $ in Millions | Apr. 01, 2019 USD ($) Bed | Feb. 15, 2019 USD ($) Bed Center | Sep. 30, 2020 Bed
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Number of beds | Bed |  |  | 18,300
Bradford [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of beds | Bed | 46 |  |
Business acquisition cash consideration | $ | $ 4.5 |  |
Whittier Pavilion [Member] | Massachusetts [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of beds | Bed |  | 71 |
Business acquisition cash consideration | $ |  | $ 17.9 |
Mission Treatment [Member] | California, Nevada, Arizona and Oklahoma [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition cash consideration | $ |  | $ 22.5 |
Number of comprehensive treatment centers operates | Center |  | 9 |

X
- Definition The number of licensed beds at the balance sheet date. + References No definition available. + Details
Name: | achc_NumberOfBeds
Namespace Prefix: | achc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of comprehensive treatment center operates. + References No definition available. + Details
Name: | achc_NumberOfComprehensiveTreatmentCentersOperate
Namespace Prefix: | achc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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

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

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=achc_BradfordRecoveryCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=achc_WhittierPavilionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_MA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=achc_MissionTreatmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=achc_CaliforniaNevadaArizonaAndOklahomaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |