v3.8.0.1

Segment Information - Schedule of Provisions for Contractual Discounts and Estimated Uncompensated Care as a Percentage of Gross Segment Billings (Detail) - Air Medical [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Provisions For Contractual Discounts And Estimated Uncompensated Care [Line Items]
Provision for contractual discounts	65.00%	65.00%	66.00%	67.00%
Provision for uncompensated care	6.00%	9.00%	7.00%	6.00%

X

- Definition

Provision for contractual discounts.

+ References

No definition available.

+ Details

Name:	phii_ProvisionPercentageContractualDiscounts
Namespace Prefix:	phii_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of provision for estimated uncompensated care.

+ References

No definition available.

+ Details

Name:	phii_ProvisionPercentageUncompensatedCare
Namespace Prefix:	phii_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Provisions For Contractual Discounts And Estimated Uncompensated Care [Line Items]

+ References

No definition available.

+ Details

Name:	phii_ProvisionsForContractualDiscountsAndEstimatedUncompensatedCareLineItems
Namespace Prefix:	phii_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=phii_AirMedicalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: