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Equity - Common Stock Offering Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended		0 Months Ended
	Jan. 20, 2015	Mar. 31, 2015	Mar. 31, 2014	Jan. 28, 2014
Class of Stock
Proceeds from sale of common stock (in shares)	11,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
Shares Issued, Price Per Share	$ 31.75us-gaap_SharesIssuedPricePerShare
Proceeds from issuance of common stock	$ 385,600us-gaap_ProceedsFromIssuanceOfCommonStock	$ 385,572us-gaap_ProceedsFromIssuanceOfCommonStock	$ 197,468us-gaap_ProceedsFromIssuanceOfCommonStock
Common Units
Class of Stock
Proceeds from issuance of common stock				$ 195,800us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Public Offering | Common Units
Class of Stock
Proceeds from sale of common stock (in shares)				8,250,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = hpp_PublicOfferingMember
Public Offering, Exercise of Over-allotment Option
Class of Stock
Proceeds from sale of common stock (in shares)	1,650,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = hpp_PublicOfferingExerciseOfOverAllotmentOptionMember
Public Offering, Exercise of Over-allotment Option | Common Units
Class of Stock
Proceeds from sale of common stock (in shares)				1,237,500us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = hpp_PublicOfferingExerciseOfOverAllotmentOptionMember
Public offering price (dollars per share)				$ 21.50hpp_StockIssuedDuringPeriodPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = hpp_PublicOfferingExerciseOfOverAllotmentOptionMember

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- Definition

Stock Issued During Period, Price Per Share

+ References

No definition available.

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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

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- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

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- Definition

Number of new stock issued during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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