The annual cash interest payments from cross currency swap agreements.

No definition available.

Name:	achc_AnnualCashInterestPaymentsFromCrossCurrencySwapAgreements
Namespace Prefix:	achc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

+ Details

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

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

- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

+ Details

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

- Details

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- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=achc_FivePointSixTwoFivePercentSeniorNotesDueTwoThousandTwentyOneMember
Namespace Prefix:
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CrossCurrencyInterestRateContractMember
Namespace Prefix:
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Derivative Instruments - Additional Information (Detail)	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2016 USD ($)	May 31, 2016 GBP (£)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	May 31, 2016 GBP (£)	Dec. 31, 2015	Jul. 01, 2014 USD ($)	Mar. 12, 2013 USD ($)
Derivative [Line Items]
Gains (losses) associated with changes in fair value of the foreign currency forward contracts			$ 100,000	$ 1,000,000	$ 500,000	$ 900,000
Cross currency swap assets			$ 40,500,000		$ 40,500,000
6.125% Senior Notes Due 2021 [Member]
Derivative [Line Items]
Principal amount										$ 150,000,000
Debt instrument interest rate			6.125%		6.125%			6.125%		6.125%
5.125% Senior Notes Due 2022 [Member]
Derivative [Line Items]
Principal amount									$ 300,000,000
Debt instrument interest rate			5.125%		5.125%			5.125%	5.125%
5.625 % Senior Notes Due 2021 [Member]
Derivative [Line Items]
Debt instrument interest rate			5.625%		5.625%
Cross Currency Swap Assets [Member]
Derivative [Line Items]
Notional amount	$ 650,000,000						£ 449,300,000
Cross currency swap agreement cash flow due to interest payment	$ 35,800,000	£ 24,700,000
Derivative exchange rate	0.0145						0.0145
Cross Currency Swap Assets [Member] \| 6.125% Senior Notes Due 2021 [Member]
Derivative [Line Items]
Principal amount	$ 150,000,000
Debt instrument interest rate	6.125%						6.125%
Cross Currency Swap Assets [Member] \| 5.125% Senior Notes Due 2022 [Member]
Derivative [Line Items]
Principal amount	$ 300,000,000
Debt instrument interest rate	5.125%						5.125%
Cross Currency Swap Assets [Member] \| 5.625 % Senior Notes Due 2021 [Member]
Derivative [Line Items]
Principal amount	$ 200,000,000
Debt instrument interest rate	5.625%						5.625%