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Long Term Debt - Components of Long-term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt $ 539,640us-gaap_LongTermDebtNoncurrent $ 543,000us-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		 500,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= phii_FivePointTwoFivePercentageSeniorNotesDueMarchFifteenTwoThousandNineteenMember
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 39,640us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember		 $ 43,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember