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Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Related Party Transaction
Monthly rental obligation under the lease	$ 12,000.000hpp_RelatedPartyTransactionMonthlyRentObligationfromSubtenant
FJM Investments, LLC
Related Party Transaction
Area of real estate property	3,707us-gaap_AreaOfRealEstateProperty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = hpp_FjmInvestmentsLlcMember

X

- Definition

Related Party Transaction, Monthly Rent Obligation from Subtenant

+ References

No definition available.

+ Details

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Namespace Prefix:	hpp_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

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- Details

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

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: