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Summary of Significant Accounting Policies - Narrative (Details) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended
Aug. 19, 2014
Mar. 31, 2015
indicator
derivative
subsidiary
property
Mar. 31, 2014
indicator
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
property
Property, Plant and Equipment            
Capitalized personnel costs   $ 900,000hpp_CapitalizedCostsPersonnel $ 600,000hpp_CapitalizedCostsPersonnel      
Capitalized interest   2,000,000us-gaap_InterestCostsCapitalized 1,600,000us-gaap_InterestCostsCapitalized      
Impairment of Long-Lived Assets            
Number of properties held for sale   0hpp_NumberOfRealEstatePropertiesHeldForSale       1hpp_NumberOfRealEstatePropertiesHeldForSale
Asset impairment charges   0us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges      
Goodwill            
Goodwill   8,754,000us-gaap_Goodwill       8,754,000us-gaap_Goodwill
Goodwill Impairment Indicators   0hpp_GoodwillImpairmentIndicators 0hpp_GoodwillImpairmentIndicators      
Accounts Receivable and Allowance for Doubtful Accounts            
Allowance for doubtful accounts   874,000us-gaap_AllowanceForDoubtfulAccountsReceivable       1,040,000us-gaap_AllowanceForDoubtfulAccountsReceivable
Bad debt (recovery) expense   (44,000)us-gaap_ProvisionForDoubtfulAccounts 83,000us-gaap_ProvisionForDoubtfulAccounts      
Notes Receivable            
Notes receivable, maximum principal 140,000,000hpp_LoansandLeasesReceivableMaximumPrincipal          
Notes receivable, share of maximum principal, percentage 23.77%hpp_LoansandLeasesReceivableShareofMaximumPrincipalPercentage          
Notes receivable, share of maximum principal, amount 33,300,000hpp_LoansandLeasesReceivableShareofMaximumPrincipal          
Notes receivable, gross   28,500,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount        
Note receivable interest rate 11.00%hpp_LoansandLeasesReceivableInterestRateStatedPercentage          
Commitment fee earned 400,000us-gaap_InterestAndFeeIncomeLoansCommercialRealEstate          
Notes receivable   28,372,000us-gaap_LoansAndLeasesReceivableNetReportedAmount       28,268,000us-gaap_LoansAndLeasesReceivableNetReportedAmount
Income Taxes            
Income tax expense   0us-gaap_IncomeTaxExpenseBenefit        
Number of subsidiaries   1hpp_NumberofSubsidiaries        
Credit-Risk-Related Contingent Features            
Number of derivatives in a net liability position   1hpp_NumberofDerivativesinaLiabilityPosition        
Cash Flow Hedging            
Derivative Financial Instruments            
Number of interest rate contracts   3us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
      3us-gaap_NumberOfInterestRateDerivativesHeld
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Allowance For Straight-Line Receivables            
Accounts Receivable and Allowance for Doubtful Accounts            
Allowance for doubtful accounts   600,000us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= hpp_AllowanceForStraightLineReceivablesMember
      600,000us-gaap_AllowanceForDoubtfulAccountsReceivable
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= hpp_AllowanceForStraightLineReceivablesMember
Building Improvements            
Property, Plant and Equipment            
Estimated useful life   39 years        
Land Improvements            
Property, Plant and Equipment            
Estimated useful life   15 years        
Furniture And Fixtures | Minimum            
Property, Plant and Equipment            
Estimated useful life   5 years        
Furniture And Fixtures | Maximum            
Property, Plant and Equipment            
Estimated useful life   7 years        
Adjustments for New Accounting Principle, Early Adoption [Member]            
Credit-Risk-Related Contingent Features            
Gain (loss) not reclassified       $ 5,500,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_AdjustmentsForNewAccountingPrincipleEarlyAdoptionMember
$ 5,500,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_AdjustmentsForNewAccountingPronouncementsAxis
= us-gaap_AdjustmentsForNewAccountingPrincipleEarlyAdoptionMember