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Investment in Real Estate - Properties Disposed (Details) $ in Thousands	1 Months Ended		3 Months Ended
	Mar. 31, 2018 USD ($) ft²	Jan. 31, 2018 USD ($) ft²	Mar. 31, 2018 USD ($) ft²	Mar. 31, 2017 USD ($)
Real Estate [Line Items]
Square feet of real estate disposed | ft²			306,065
Sales Price			$ 241,000
Gains on sale of real estate			$ 37,674	$ 16,866
2600 Campus Drive
Real Estate [Line Items]
Square feet of real estate disposed | ft²		63,050
Sales Price		$ 22,500
Embarcadero Place
Real Estate [Line Items]
Square feet of real estate disposed | ft²		197,402
Sales Price		$ 136,000
2180 Sand Hill
Real Estate [Line Items]
Square feet of real estate disposed | ft²	45,613
Sales Price	$ 82,500

X

- Definition

Area Of Real Estate Disposed

+ References

No definition available.

+ Details

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Namespace Prefix:	hpp_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Asset Disposition, Sales Price

+ References

No definition available.

+ Details

Name:	hpp_AssetDispositionSalesPrice
Namespace Prefix:	hpp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This element represents the amount of gain (loss) on sale of properties during the reporting period net of the applicable income taxes realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 974
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-15.(a)(1)(ii))
-URI http://asc.fasb.org/extlink&oid=6875705&loc=d3e641549-123027

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

Name:	us-gaap_RealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=hpp_A2600CampusDriveMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=hpp_EmbarcaderoPlaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=hpp_A2180SandHillMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: