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Long-term Debt - Components of Long-term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 543,000us-gaap_LongTermDebtNoncurrent $ 379,000us-gaap_LongTermDebtNoncurrent
5.25% Senior Notes due March 15, 2019 [Member]    
Debt Instrument [Line Items]    
Long-term debt 500,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= phii_FivePointTwoFivePercentageSeniorNotesDueMarchFifteenTwoThousandNineteenMember		  
8.625% Senior Notes due October 15, 2018 [Member]    
Debt Instrument [Line Items]    
Long-term debt   300,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= phii_EightPointSixTwoFivePercentageSeniorNotesDueOctoberFifteenTwoThousandEighteenMember
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 43,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		 $ 79,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember