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Share-Based Compensation - Schedule of Restricted Stock Units to be Settled in Cash (Detail) - shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Beginning balance of Outstanding, Restricted Stock Units to be Settled in Cash | 81,508 | 212,794 | 471,728
Restricted Stock Units to be Settled in Cash, Vested | (81,508) | (129,116) | (214,192)
Restricted Stock Units to be Settled in Cash, Forfeited |  | (2,170) | (44,742)
Ending balance of Outstanding, Restricted Stock Units to be Settled in Cash |  | 81,508 | 212,794

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period for equity-based payment instruments to be settled in cash. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedSettledInCash
Namespace Prefix: | prdo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments which are to be settled in cash, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonVestedNumberSettledInCash
Namespace Prefix: | prdo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period for equity-based payment instruments to be settled in cash. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedSettledInCash
Namespace Prefix: | prdo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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