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Commitments and Contingencies - Narrative (Details) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Customer Concentration Risk | Sales |  |
Loss Contingencies |  |
Percentage of revenue from one industry | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 17.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Minimum |  |
Loss Contingencies |  |
Principal amount guaranteed | 19.50%hpp_GuarantorObligationsPrincipalAmountGuaranteedPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum |  |
Loss Contingencies |  |
Principal amount guaranteed | 35.00%hpp_GuarantorObligationsPrincipalAmountGuaranteedPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |

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