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Derivative Financial Instruments - Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($)
Interest-rate Swap Contracts | Maximum |
Derivative [Line Items] |
Estimate change in fair value of derivative for assumption of one percentage point change in the interest rate | $ 2

X
- Definition Amount of estimate change in fair value of each of the underlying derivative instruments assuming one percentage point change in the underlying derivative instruments + References No definition available. + Details
Name: | peak_EstimateChangeInFairValueOfDerivativeForAssumptionOfOnePercentagePointChangeInInterestRate
Namespace Prefix: | peak_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
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: |