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Subsequent Event (Details) - Subsequent Event - 2010 Plan - Executive Officer	Jan. 01, 2020
Share-based Payment Arrangement, Tranche One
Subsequent Event [Line Items]
Award performance period (in years)	3 years
Share-based Payment Arrangement, Tranche Two
Subsequent Event [Line Items]
Award performance period (in years)	1 year

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Performance Period

+ References

No definition available.

+ Details

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

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ 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

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

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- Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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