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Long-term Debt - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 18, 2013
Debt Instrument [Line Items]      
Interest rate on Senior Notes 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage    
Proceeds from issuance of senior notes $ 500,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt    
Repayment of Senior Notes 300,000,000us-gaap_EarlyRepaymentOfSeniorDebt    
Pretax charge related to early redemption of senior notes (29,833,000)us-gaap_GainsLossesOnExtinguishmentOfDebt    
Carrying value of senior notes 543,000,000us-gaap_LongTermDebtNoncurrent 379,000,000us-gaap_LongTermDebtNoncurrent  
Letters of credit outstanding under the facility 15,500,000us-gaap_LettersOfCreditOutstandingAmount 15,500,000us-gaap_LettersOfCreditOutstandingAmount  
Letter of credit securing workers compensation policy 2,500,000us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent 2,900,000us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent  
Middle East [Member]      
Debt Instrument [Line Items]      
Revolving credit facility, maturity date Oct. 29, 2015    
Letter of credit securing contract in Middle East 9,200,000phii_StandbyLettersOfCreditContractualAmount
/ us-gaap_StatementGeographicalAxis
= us-gaap_MiddleEastMember
   
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Carrying value of senior notes 43,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
79,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Increased Borrowing capacity     150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Revolving credit facility, maturity date Oct. 01, 2016    
Revolving Credit facility , Covenants, consolidated working capital ratio 200.00%phii_WorkingCapitalRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Revolving Credit facility , Covenants, consolidated net worth ratio 150.00%phii_LineOfCreditFacilityDebtToNetWorthRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Revolving Credit facility , Covenants, fixed coverage ratio 110.00%phii_LineOfCreditFacilityFixedChargeCoverageRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Revolving Credit facility , Covenants, consolidated net worth 450,000,000phii_MinimumNetWorthAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Letter of credit securing workers compensation policy 6,300,000us-gaap_WorkersCompensationLiabilityCurrentAndNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Revolving Credit Facility [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
LIBOR plus interest rate on borrowed funds 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
5.25% Senior Notes due March 15, 2019 [Member]      
Debt Instrument [Line Items]      
Percentage of principal amount redeemed 101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= phii_FivePointTwoFivePercentageSeniorNotesDueMarchFifteenTwoThousandNineteenMember
   
Interest rate on Senior Notes 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= phii_FivePointTwoFivePercentageSeniorNotesDueMarchFifteenTwoThousandNineteenMember
   
Proceeds from issuance of senior notes 493,800,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= phii_FivePointTwoFivePercentageSeniorNotesDueMarchFifteenTwoThousandNineteenMember
   
Fair market value of Senior Notes 425,600,000us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= phii_FivePointTwoFivePercentageSeniorNotesDueMarchFifteenTwoThousandNineteenMember
   
Carrying value of senior notes 500,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= phii_FivePointTwoFivePercentageSeniorNotesDueMarchFifteenTwoThousandNineteenMember
   
8.625% Senior Notes due October 15, 2018 [Member]      
Debt Instrument [Line Items]      
Interest rate on Senior Notes 8.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= phii_EightPointSixTwoFivePercentageSeniorNotesDueOctoberFifteenTwoThousandEighteenMember
   
Repayment of Senior Notes 300,000,000us-gaap_EarlyRepaymentOfSeniorDebt
/ us-gaap_LongtermDebtTypeAxis
= phii_EightPointSixTwoFivePercentageSeniorNotesDueOctoberFifteenTwoThousandEighteenMember
   
Cost of debt repayment 329,400,000phii_CostOfEarlyExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= phii_EightPointSixTwoFivePercentageSeniorNotesDueOctoberFifteenTwoThousandEighteenMember
   
Pretax charge related to early redemption of senior notes (29,833,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= phii_EightPointSixTwoFivePercentageSeniorNotesDueOctoberFifteenTwoThousandEighteenMember
   
Premium on early redemption of senior notes (26,749,000)us-gaap_GainsLossesOnExtinguishmentOfDebtBeforeWriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= phii_EightPointSixTwoFivePercentageSeniorNotesDueOctoberFifteenTwoThousandEighteenMember
   
Write off of unamortized financing costs 3,100,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_LongtermDebtTypeAxis
= phii_EightPointSixTwoFivePercentageSeniorNotesDueOctoberFifteenTwoThousandEighteenMember
   
Fair market value of Senior Notes   323,200,000us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= phii_EightPointSixTwoFivePercentageSeniorNotesDueOctoberFifteenTwoThousandEighteenMember
 
Carrying value of senior notes   $ 300,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= phii_EightPointSixTwoFivePercentageSeniorNotesDueOctoberFifteenTwoThousandEighteenMember