v3.5.0.2

Revenue Recognition and Valuation Accounts - Schedule of Allowance for Contractual Discounts and Estimated Uncompensated Care as a Percentage of Gross Segment Accounts Receivable (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Revenue Recognition And Valuation Accounts [Abstract] |  |
Allowance for Contractual Discounts | 60.00% | 56.00%
Allowance for Uncompensated Care | 18.00% | 23.00%

X
- Definition Percentage of allowance for contractual discounts. + References No definition available. + Details
Name: | phii_PercentageOfAllowanceForContractualDiscounts
Namespace Prefix: | phii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of allowance for uncompensated care. + References No definition available. + Details
Name: | phii_PercentageOfAllowanceForUncompensatedCare
Namespace Prefix: | phii_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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