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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) | 11,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |
Shares Issued, Price Per Share | $ 31.75 us-gaap_SharesIssuedPricePerShare |  |  |
Proceeds from issuance of common stock | $ 385,600 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 385,572 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 197,468 us-gaap_ProceedsFromIssuanceOfCommonStock |
Common Units |  |  |  |
Class of Stock |  |  |  |
Proceeds from issuance of common stock |  |  |  | $ 195,800 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember
Public Offering | Common Units |  |  |  |
Class of Stock |  |  |  |
Proceeds from sale of common stock (in shares) |  |  |  | 8,250,000 us-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) | 1,650,000 us-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) |  |  |  | 1,237,500 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = hpp_PublicOfferingExerciseOfOverAllotmentOptionMember
Public offering price (dollars per share) |  |  |  | $ 21.50 hpp_StockIssuedDuringPeriodPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_SubsidiarySaleOfStockAxis = hpp_PublicOfferingExerciseOfOverAllotmentOptionMember

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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 + Details
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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 + Details
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