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Stock-Based Compensation - Outperformance Plan (Details) - USD ($)	Dec. 31, 2017	Feb. 28, 2017	Dec. 31, 2016
Outperformance Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum bonus pool	$ 20,000,000.0	$ 20,000,000.0	$ 17,500,000.0

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Maximum Share Value Authorized Under Plan

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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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

X

- Details

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