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Summary of Significant Accounting Policies - Schedule of Provisions for Contractual Discounts and Estimated Uncompensated Care Applied to Air Medical Revenues Expressed as Percentage of Total Segment Billings (Detail) (Air Medical [Member], Sales Revenue, Net [Member])
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Air Medical [Member] | Sales Revenue, Net [Member]
      
Provisions For Contractual Discounts And Estimated Uncompensated Care [Line Items]      
Provision for contractual discounts 72.00%phii_PercentageOfProvisionForContractualDiscounts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember		 60.00%phii_PercentageOfProvisionForContractualDiscounts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember		 56.00%phii_PercentageOfProvisionForContractualDiscounts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember
Provision for uncompensated care 2.00%phii_PercentageOfProvisionForEstimatedUncompensatedCare
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember		 10.00%phii_PercentageOfProvisionForEstimatedUncompensatedCare
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember		 11.00%phii_PercentageOfProvisionForEstimatedUncompensatedCare
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember