Name:	amch_DebtCovenantAssumedInterestRateForAdditionalDebt
Namespace Prefix:	amch_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The maximum additional debt allowed under the debt covenants.

No definition available.

Name:	amch_DebtCovenantMaximumAdditionalDebt
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The maximum amount of dividends that the entity may declare under debt covenents.

No definition available.

Name:	amch_DebtCovenantMaximumDividends
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the consent fee payable as a percentage of principal amount at the closing date of the proposed acquisition.

No definition available.

Name:	amch_DebtInstrumentConsentFeeAsPercentOfPrincipalAmount
Namespace Prefix:	amch_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the consecutive period of stay of enforcement below which considered as events of default under the debt arrangement.

No definition available.

Name:	amch_DebtInstrumentCovenantStayEnforcementConsecutivePeriod
Namespace Prefix:	amch_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The closing price of the debt instrument on the day of its offering, used to determine the instrument's fair value.

No definition available.

Name:	amch_DebtInstrumentFairValueInputClosingPrice
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the other expenses incurred in relation to debt instrument.

No definition available.

Name:	amch_DebtInstrumentOtherExpenses
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the purchase amount per $1,000 of debt repurchased.

No definition available.

Name:	amch_DebtRepurchaseAmountPer1000DollarsOfPrincipalPurchased
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the principal amount of the debt tendered for exchange as a percentage of principal amount of the outstanding debt, as of the expiration date.

No definition available.

Name:	amch_PrincipalAmountOfDebtTenderedForExchangeAsPercentageOfOutstandingDebt
Namespace Prefix:	amch_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the aggregate principal amount of the debt validly tendered under exchange offer, as of the expiration date.

No definition available.

Name:	amch_PrincipalAmountOfDebtValidlyTenderedUnderExchangeOffer
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The maximum period for the registration agreement to become effective.

No definition available.

Name:	amch_RegistrationAgreementMaximumPeriodForEffectiveness
Namespace Prefix:	amch_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Per the registration agreement, the maximum period allowed for filing with the SEC.

No definition available.

Name:	amch_RegistrationAgreementMaximumPeriodForFiling
Namespace Prefix:	amch_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 230
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
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Name:	us-gaap_AmortizationOfDebtDiscountPremium
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_DebtInstrumentFaceAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 210
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Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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.

No definition available.

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

Start date of debt instrument redemption period, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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Name:	us-gaap_DebtInstrumentRedemptionPeriodStartDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Name:	us-gaap_DeferredFinanceCostsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Gross amount of debt extinguished.

No definition available.

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

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

No definition available.

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

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=amch_SeniorSecuredNotes6.0PercentDue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=amch_PromissoryNote5PercentDue2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=amch_SeniorSubordinatedNotes5.75PercentDue2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=amch_SeniorSubordinatedNotes5.875PercentDue2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=amch_Senior8.75PercentFixedRateNotesDue2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=amch_SeniorSubordinatedNotes9.75PercentDue2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DebtInstrumentAxis=amch_SeniorSubordinatedNotes6.375PercentDue2024Member
Namespace Prefix:
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