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Investment in Real Estate (Details) (Disposal Group, Not Discontinued Operations, First Financial, USD $)
In Millions, unless otherwise specified
Mar. 06, 2015
Disposal Group, Not Discontinued Operations | First Financial
 
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations  
Discontinued operations, sales price $ 89.0us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
/ us-gaap_DisposalGroupClassificationAxis
= us-gaap_DisposalGroupNotDiscontinuedOperationsMember
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= hpp_FirstFinancialMember