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Equity - Stock-Based Compensation Narrative (Details)	3 Months Ended
	Mar. 31, 2015
Existing and Newly Elected Board Member
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period	3 years
Employees
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period	3 years

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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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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X

- Details

Name:	us-gaap_PlanNameAxis=hpp_StockBasedCompensationExistingAndNewlyElectedBoardMemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: