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Long-term Debt - Components of Long-term Debt (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
Debt Instrument [Line Items]  
Interest rate on Senior Notes 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
5.25% Senior Notes due March 15, 2019 [Member]  
Debt Instrument [Line Items]  
Interest rate on Senior Notes 5.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= phii_FivePointTwoFivePercentageSeniorNotesDueMarchFifteenTwoThousandNineteenMember
Senior Notes payable periods Mar. 15, 2019
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
Senior Notes payable periods Oct. 15, 2018