Derivative Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Long-term debt, gross	$ 826,236	$ 766,964
Interest Rate Cap [Member]
Derivative [Line Items]
Notional amount	887,700
Long-term debt, gross	818,100
Interest Rate Cap [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	844,200	224,500
Cost of derivative	$ 375	$ 13
Interest Rate Cap [Member] \| Minimum [Member]
Derivative [Line Items]
Strike rate	2.00%
Interest Rate Cap [Member] \| Minimum [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Strike rate	3.00%	5.43%
Interest Rate Cap [Member] \| Maximum [Member]
Derivative [Line Items]
Strike rate	11.61%
Interest Rate Cap [Member] \| Maximum [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Strike rate	11.61%	5.78%
Interest Rate Floor [Member]
Derivative [Line Items]
Notional amount	$ 6,900,000
Interest Rate Floor [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	3,900,000
Cost of derivative	$ 140
Interest Rate Floor [Member] \| Minimum [Member]
Derivative [Line Items]
Floor interest rate	(0.25%)
Interest Rate Floor [Member] \| Minimum [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Strike rate	1.00%
Interest Rate Floor [Member] \| Maximum [Member]
Derivative [Line Items]
Strike rate	1.50%
Interest Rate Floor [Member] \| Maximum [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Strike rate	1.50%
Credit Default Swap [Member]
Derivative [Line Items]
Notional amount	$ 50,000
Maximum exposure	2,400
Change in market value threshold for settlement	$ 250
Eurodollar Future [Member]
Derivative [Line Items]
Cost of derivative		$ 124

Credit Derivative, Change in Market Value Threshold for Settlement

No definition available.

Name:	ahp_CreditDerivativeChangeinMarketValueThresholdforSettlement
Namespace Prefix:	ahp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5708775-113959

+ Details

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

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFloorInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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

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

- Definition

The cash outflow for cost incurred directly with the issuance of a derivative security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ 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

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- Details

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- Details

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- Details

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Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
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