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Summary of Significant Accounting Policies - Provisions for Contractual Discounts and Uncompensated Care Applied to Air Medical Trade Receivables Expressed as Percentage of Total Segment Billings (Detail) (Air Medical [Member], Trade Accounts Receivable [Member])
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Air Medical [Member] | Trade Accounts Receivable [Member]
    
Provisions For Contractual Discounts And Estimated Uncompensated Care [Line Items]    
Allowance for contractual discounts 53.00%phii_PercentageOfProvisionForContractualDiscounts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember		 44.00%phii_PercentageOfProvisionForContractualDiscounts
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember
Allowance for uncompensated care 23.00%phii_PercentageOfProvisionForUncompensatedCare
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember		 27.00%phii_PercentageOfProvisionForUncompensatedCare
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_TradeAccountsReceivableMember
/ us-gaap_StatementBusinessSegmentsAxis
= phii_AirMedicalMember