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Equity - 6.25% Series A Cumulative Redeemable Preferred Units of the Operating Partnership Narrative (Details) (6.25% series A cumulative redeemable preferred units of the Operating Partnership, USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
6.25% series A cumulative redeemable preferred units of the Operating Partnership
   
Class of Stock    
Shares outstanding of preferred stock 407,066us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= hpp_SeriesCumulativeRedeemablePreferredUnitsOfOperatingPartnershipMember
 
Interest rate of preferred stock 6.25%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= hpp_SeriesCumulativeRedeemablePreferredUnitsOfOperatingPartnershipMember
6.25%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= hpp_SeriesCumulativeRedeemablePreferredUnitsOfOperatingPartnershipMember
Liquidation preference of preferred stock (dollars per share) $ 25us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= hpp_SeriesCumulativeRedeemablePreferredUnitsOfOperatingPartnershipMember