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Leases - Schedule of Future Minimum Sublease Rental Income under Operating Leases for Continuing Operations (Detail) $ in Thousands | Dec. 31, 2020 USD ($)
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Leases [Abstract] |  |
Operating Subleases, 2021 | $ 949 | [1]
Operating Subleases, 2022 | 777 |
Operating Subleases, 2023 | 330 |
Operating Subleases, Total | $ 2,056 |
[1] | Sublease receivables remaining as of December 31, 2020

X
- Definition Amount of minimum sublease rentals to be received by the seller-lessee for all operating leases. + References No definition available. + Details
Name: | prdo_FutureMinimumSubleaseRentalsUnderOperatingLeases
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of minimum sublease rentals to be received by the seller-lessee in the next fiscal year. + References No definition available. + Details
Name: | prdo_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinOneYear
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of minimum sublease rentals to be received by the seller-lessee in the next three fiscal years. + References No definition available. + Details
Name: | prdo_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinThreeYears
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of minimum sublease rentals to be received by the seller-lessee in the next two fiscal years. + References No definition available. + Details
Name: | prdo_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinTwoYears
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration