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Consolidated Balance Sheets (Parentheticals) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Common Stock:
Common Stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	0.01us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, shares authorized	490,000,000us-gaap_CommonStockSharesAuthorized	490,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares outstanding	66,797,816us-gaap_CommonStockSharesOutstanding	57,230,199us-gaap_CommonStockSharesOutstanding
Series A Cumulative Redeemable Preferred Units of the Operating Partnership
Temporary Equity, dividend rate percentage	6.25%hpp_TemporaryEquityDividendRatePercentage / us-gaap_StatementClassOfStockAxis = hpp_SeriesCumulativeRedeemablePreferredUnitsOfOperatingPartnershipMember	6.25%hpp_TemporaryEquityDividendRatePercentage / us-gaap_StatementClassOfStockAxis = hpp_SeriesCumulativeRedeemablePreferredUnitsOfOperatingPartnershipMember
Preferred Stock:
Series B Cumulative Redeemable Preferred Stock, Dividend Rate Percentage	6.25%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = hpp_SeriesCumulativeRedeemablePreferredUnitsOfOperatingPartnershipMember
Series B Cumulative Redeemable Preferred Stock, Liquidation Preference Per Share	$ 25.00us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = hpp_SeriesCumulativeRedeemablePreferredUnitsOfOperatingPartnershipMember
Series B Preferred Stock
Preferred Stock:
Series B Cumulative Redeemable Preferred Stock, Par Value Per Share	$ 0.01us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember	0.01us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series B Cumulative Redeemable Preferred Stock, Shares Authorized	10,000,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember	10,000,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series B Cumulative Redeemable Preferred Stock, Shares Outstanding	5,800,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember	5,800,000us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series B Cumulative Redeemable Preferred Stock, Dividend Rate Percentage	8.375%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember	8.375%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Series B Cumulative Redeemable Preferred Stock, Liquidation Preference Per Share	$ 25us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember	25us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember

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