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Subsequent Events - Common Stock Offering (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 20, 2015
Subsequent Event [Line Items]
Proceeds from issuance of common stock	$ 197,468us-gaap_ProceedsFromIssuanceOfCommonStock	$ 202,542us-gaap_ProceedsFromIssuanceOfCommonStock	$ 190,798us-gaap_ProceedsFromIssuanceOfCommonStock
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock issued				11,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Share price				$ 31.75us-gaap_SharesIssuedPricePerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Proceeds from issuance of common stock				$ 385,200us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Exercise of Over-allotment Option | Subsequent Event [Member]
Subsequent Event [Line Items]
Stock issued				1,650,000us-gaap_StockIssuedDuringPeriodSharesNewIssues / hpp_SaleOfStockAxis = hpp_PublicOfferingExerciseOfOverAllotmentOptionMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- 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=31042434&loc=d3e3255-108585

+ Details

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

X

- Definition

Amount per share or per unit of equity securities issued by non-development stage entity.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesIssuedPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of new stock issued during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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 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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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- Details

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Period Type:	duration

X

- 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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Period Type: