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Leases - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019
Lessee Lease Description [Line Items]
Rright-of-use assets		$ 552,334
Lease liabilities		$ 584,392
Operating leases remaining lease term	1 year
ASU 2016-02 [Member]
Lessee Lease Description [Line Items]
Rright-of-use assets	$ 509,800
Lease liabilities	$ 536,700
Minimum [Member]
Lessee Lease Description [Line Items]
Lessee operating and finance lease term of contract		5 years
Minimum [Member] | Copiers and Equipment [Member]
Lessee Lease Description [Line Items]
Lessee operating and finance lease term of contract		1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Lessee operating and finance lease term of contract		30 years
Maximum [Member] | Copiers and Equipment [Member]
Lessee Lease Description [Line Items]
Lessee operating and finance lease term of contract		3 years

X

- Definition

Amount of lessee's obligation for lease payments total.

+ References

No definition available.

+ Details

Name:	achc_LeaseLiability
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's right of use underlying assets total.

+ References

No definition available.

+ Details

Name:	achc_LeaseRightOfUseAsset
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Lessee operating and finance lease term of contract.

+ References

No definition available.

+ Details

Name:	achc_LesseeOperatingAndFinanceLeaseTermOfContract
Namespace Prefix:	achc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessee operating leases remaining lease term.

+ References

No definition available.

+ Details

Name:	achc_LesseeOperatingLeasesRemainingLeaseTerm
Namespace Prefix:	achc_
Data Type:	xbrli:durationItemType
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_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=achc_CopiersAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: