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Investment in Real Estate - Properties Disposed (Details)			3 Months Ended		9 Months Ended
	Mar. 21, 2017 USD ($) ft²	Feb. 14, 2017 USD ($) ft²	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) ft²	Sep. 30, 2016 USD ($)
Real Estate [Line Items]
Square feet of real estate disposed | ft²					199,484
Sales Price					$ 86,800,000
Gains on sale of real estate			$ 0	$ 0	$ 16,866,000	$ 8,515,000
222 Kearny Street
Real Estate [Line Items]
Square feet of real estate disposed | ft²		148,797
Sales Price		$ 51,800,000
3402 Pico Boulevard
Real Estate [Line Items]
Square feet of real estate disposed | ft²	50,687
Sales Price	$ 35,000,000

X

- Definition

Area Of Real Estate Disposed

+ References

No definition available.

+ Details

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

X

- Definition

Asset Disposition, Sales Price

+ References

No definition available.

+ Details

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Namespace Prefix:	hpp_
Data Type:	xbrli:monetaryItemType
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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

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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

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- Details

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- Details

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