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Investment in Real Estate - Real Estate Investment Property (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investment in real estate        
Beginning balance $ 2,035,330us-gaap_RealEstateGrossAtCarryingValue $ 1,475,955us-gaap_RealEstateGrossAtCarryingValue $ 1,060,504us-gaap_RealEstateGrossAtCarryingValue  
Acquisitions 114,008us-gaap_RealEstateOtherAcquisitions 538,322us-gaap_RealEstateOtherAcquisitions 390,370us-gaap_RealEstateOtherAcquisitions  
Improvements, capitalized costs 128,018us-gaap_RealEstateImprovements 89,707us-gaap_RealEstateImprovements 27,901us-gaap_RealEstateImprovements  
Disposal (37,615)us-gaap_RealEstateOtherDeductions (9,638)us-gaap_RealEstateOtherDeductions (2,820)us-gaap_RealEstateOtherDeductions  
Cost of property sold 0us-gaap_RealEstateCostOfRealEstateSold (59,016)us-gaap_RealEstateCostOfRealEstateSold 0us-gaap_RealEstateCostOfRealEstateSold  
Ending Balance 2,239,741us-gaap_RealEstateGrossAtCarryingValue 2,035,330us-gaap_RealEstateGrossAtCarryingValue 1,475,955us-gaap_RealEstateGrossAtCarryingValue  
Reclassification to assets associated with real estate held for sale (68,446)hpp_SECScheduleIIIRealEstateAssetsReclassifiedtoHeldtosale (82,305)hpp_SECScheduleIIIRealEstateAssetsReclassifiedtoHeldtosale 0hpp_SECScheduleIIIRealEstateAssetsReclassifiedtoHeldtosale  
Total real estate held for investment 2,171,295us-gaap_RealEstateInvestmentPropertyAtCost 1,953,025us-gaap_RealEstateInvestmentPropertyAtCost 1,475,955us-gaap_RealEstateInvestmentPropertyAtCost  
Accumulated depreciation        
Beginning balance (108,411)us-gaap_RealEstateAccumulatedDepreciation (85,184)us-gaap_RealEstateAccumulatedDepreciation    
Additions (50,044)us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense (41,454)us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense (34,675)us-gaap_SECScheduleIIIRealEstateAccumulatedDepreciationDepreciationExpense  
Deletions 23,825us-gaap_RealEstateAccumulatedDepreciationRealEstateSold 10,296us-gaap_RealEstateAccumulatedDepreciationRealEstateSold 2,820us-gaap_RealEstateAccumulatedDepreciationRealEstateSold  
Ending Balance 142,561hpp_SECScheduleIIIRealEstateAccumulatedDepreciationIncludingAmountsReclassifiedasHeldforsale 116,342hpp_SECScheduleIIIRealEstateAccumulatedDepreciationIncludingAmountsReclassifiedasHeldforsale 85,184hpp_SECScheduleIIIRealEstateAccumulatedDepreciationIncludingAmountsReclassifiedasHeldforsale 53,329hpp_SECScheduleIIIRealEstateAccumulatedDepreciationIncludingAmountsReclassifiedasHeldforsale
Reclassification to assets associated with real estate held for sale 7,904hpp_SECScheduleIIIRealEstateandAccumulatedDepreciationAssetsReclassifiedtoHeldforsale 7,931hpp_SECScheduleIIIRealEstateandAccumulatedDepreciationAssetsReclassifiedtoHeldforsale 0hpp_SECScheduleIIIRealEstateandAccumulatedDepreciationAssetsReclassifiedtoHeldforsale  
Total Accumulated depreciation $ (134,657)us-gaap_RealEstateAccumulatedDepreciation $ (108,411)us-gaap_RealEstateAccumulatedDepreciation $ (85,184)us-gaap_RealEstateAccumulatedDepreciation