v3.6.0.2

Summary of Significant Accounting Policies - Schedule of Provisions for Contractual Discounts and Estimated Uncompensated Care Applied to Air Medical Revenues Expressed as Percentage of Total Independent Provider Model Billings (Detail) - Air Medical [Member]	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Provisions For Contractual Discounts And Estimated Uncompensated Care [Line Items]
Provision for contractual discounts	67.00%	65.00%	72.00%
Provision for uncompensated care	6.00%	8.00%	2.00%

X

- Definition

Provision for contractual discounts.

+ References

No definition available.

+ Details

Name:	phii_PercentageOfProvisionForContractualDiscounts
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_PercentageOfProvisionForEstimatedUncompensatedCare
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: