XML 93 R79.htm IDEA: XBRL DOCUMENT
v3.20.4

Share-Based Compensation - Schedule of Deferred Stock Units to be Settled in Shares (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |  |
Beginning balance of Outstanding, Deferred Stock Units to be Settled in Shares | [1] | 73,095 | 76,023 |  | 76,023
Granted, Deferred Stock Units to be Settled in Shares |  | 0 | 0 |  | 0
Vested, Deferred Stock Units to be Settled in Shares |  | 0 | (2,928) | [2] | 0
Forfeited, Deferred Stock Units to be Settled in Shares |  | 0 | 0 |  | 0
Ending balance of Outstanding, Deferred Stock Units to be Settled in Shares | [1] | 73,095 | 73,095 |  | 76,023
Beginning balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit | [1] | $ 4.39 | $ 4.44 |  | $ 4.44
Granted, Weighted Average Grant-Date Fair Value Per Unit |  | 0 | 0 |  | 0
Vested, Weighted Average Grant-Date Fair Value Per Unit |  | 0 | 5.56 | [2] | 0
Forfeited, Weighted Average Grant-Date Fair Value Per Unit |  | 0 | 0 |  | 0
Ending balance of Outstanding, Weighted Average Grant-Date Fair Value Per Unit | [1] | $ 4.39 | $ 4.39 |  | $ 4.44
[1] | Includes vested but unreleased awards. These awards are included in total outstanding awards until they are released under the terms of the agreement.
[2] | Includes previously vested awards which were released during the period.

X
- Definition The number of equity-based deferred stock units that vested during the reporting period. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitVestedInPeriod
Namespace Prefix: | prdo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of equity-based deferred stock units, that were forfeited during the reporting period. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsForfeitedInPeriod
Namespace Prefix: | prdo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period for deferred stock units. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsGrantsInPeriod
Namespace Prefix: | prdo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award deferred stock units grants in period weighted average grant date fair value. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | prdo_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award deferred stock units nonvested forfeited weighted average grant date fair value. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsNonvestedForfeitedWeightedAverageGrantDateFairValue
Namespace Prefix: | prdo_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award deferred stock units unreleased number. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsUnreleasedNumber
Namespace Prefix: | prdo_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share based compensation arrangement by share based payment award deferred stock units unreleased weighted average grant date fair value. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsUnreleasedWeightedAverageGrantDateFairValue
Namespace Prefix: | prdo_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share based compensation arrangement by share based payment award deferred stock units vested weighted average grant date fair value. + References No definition available. + Details
Name: | prdo_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsVestedWeightedAverageGrantDateFairValue
Namespace Prefix: | prdo_
Data Type: | num:perShareItemType
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