v3.8.0.1

Revenue Recognition and Valuation Accounts (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2017
Revenue Recognition And Valuation Accounts [Abstract] |
Schedule of Allowance for Contractual Discounts and Estimated Uncompensated Care as a Percentage of Gross Segment Accounts Receivable | The allowance for contractual discounts and estimated uncompensated care (expressed as a percentage of gross segment accounts receivable) as of the dates listed below was as follows:
|  | September 30, 2017 |  | December 31, 2016
Allowance for Contractual Discounts |  | 58 | % |  | 56 | %
Allowance for Uncompensated Care |  | 21 | % |  | 23 | %

X
- Definition Revenue Recognition and Valuation Accounts [Abstract] + References No definition available. + Details
Name: | phii_RevenueRecognitionAndValuationAccountsAbstract
Namespace Prefix: | phii_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of allowance for contractual discounts and estimated uncompensated care as percentage of gross accounts receivable. + References No definition available. + Details
Name: | phii_ScheduleOfAllowanceForContractualDiscountsAndEstimatedUncompensatedCareAsPercentageOfGrossAccountsReceivableTableTextBlock
Namespace Prefix: | phii_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration