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Credit Agreement - Schedule of Credit Agreement (Detail) - Credit Agreement [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Credit Agreement: |  |  |
Credit facility remaining availability |  | $ 48,582 | $ 47,782
Outstanding letters of credit |  | 1,418 | 2,218
Availability of additional letters of credit | [1] | $ 23,582 | $ 22,782
Weighted average annual interest rate |  | 0.00% | 0.00%
Commitment fee rate |  | 0.30% | 0.30%
Letter of credit fee rate |  | 1.25% | 1.25%
[1] | The letters of credit sublimit of $25.0 million under the credit agreement is part of, not in addition to, the $50.0 million borrowing limit under the credit agreement.

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- Definition Credit agreements. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of credit facility availability for additional letters of credit. + References No definition available. + Details
Name: | prdo_LineOfCreditFacilityAvailabilityForAdditionalLettersOfCredit
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line of credit facility percentage of letter of credit fee rate. + References No definition available. + Details
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Namespace Prefix: | prdo_
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Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The effective interest rate during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Details
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