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Subsequent Events - Acquisitions (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 20, 2015 | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Apr. 01, 2015 | Apr. 10, 2015 | Oct. 29, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Gross payments to acquire business |  |  |  |  | $ 113,580,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |
Debt instrument carrying amount |  | 784,571,000 us-gaap_DebtInstrumentCarryingAmount |  |  | 915,003,000 us-gaap_DebtInstrumentCarryingAmount |  |  |  |  |
Repayments of Notes Payable |  | 173,200,000 us-gaap_RepaymentsOfNotesPayable |  | 156,147,000 us-gaap_RepaymentsOfNotesPayable |  |  |  |  |  |
Proceeds from sale of common stock (in shares) | 11,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |  |  |
Subsequent Event | EOP Northern California Portfolio |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Area of real estate property |  |  |  |  |  |  | 8,200,000 us-gaap_AreaOfRealEstateProperty / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Gross payments to acquire business |  |  |  |  |  |  | 1,750,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Consideration transferred, common units |  |  |  |  |  |  | 63,500,000 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
275 Brannan |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument carrying amount |  | 15,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = hpp_Location275BrannanMember | [1] |  | 15,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = hpp_Location275BrannanMember | [1] |  |  |  |
275 Brannan | Subsequent Event |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  | 15,000,000 us-gaap_ExtinguishmentOfDebtAmount / us-gaap_DebtInstrumentAxis = hpp_Location275BrannanMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | [1] |
901 Market |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument carrying amount |  | 49,600,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = hpp_Location901MarketMember | [2] |  | 49,600,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = hpp_Location901MarketMember | [2] |  |  |  | 49,600,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = hpp_Location901MarketMember
901 Market | Subsequent Event |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument carrying amount |  |  |  |  |  |  |  | 30,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = hpp_Location901MarketMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | [2] |
Repayments of Notes Payable |  |  |  |  |  |  |  | $ 19,600,000 us-gaap_RepaymentsOfNotesPayable / us-gaap_DebtInstrumentAxis = hpp_Location901MarketMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |
Private Placement | Subsequent Event |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock (in shares) |  |  |  |  |  |  |  | 6,037,500 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |  |
Office Building | Subsequent Event | EOP Northern California Portfolio |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of real estate properties acquired |  |  |  |  |  |  | 26 hpp_NumberOfRealEstatePropertiesAcquired / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_OfficeBuildingMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Development Parcel | Subsequent Event | EOP Northern California Portfolio |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Development projects acquired |  |  |  |  |  |  | 2 hpp_RealEstateDevelopmentProjectsAcquiredNumber / us-gaap_BusinessAcquisitionAxis = hpp_EOPNorthernCaliforniaPortfolioMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = hpp_DevelopmentParcelMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
[1] | Subsequent to March 31, 2015 the loan was fully repaid.
[2] | On October 29, 2012, we obtained a loan for our 901 Market property pursuant to which we borrowed $49.6 million upon closing, with the ability to draw up to an additional $11.9 million for budgeted base building, tenant improvements, and other costs associated with the renovation and lease-up of that property.

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