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Leases - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2021 Lease
Lessee Lease Description [Line Items] |
Operating leases expiration date | 2032
Number of subleases | 1
Sublease expiration date | May 30, 2023
Number of leases related to ongoing operations | 12
Minimum [Member] |
Lessee Lease Description [Line Items] |
Lease term range, years | 5 years
Number of renewal options for extended terms | 1 year
Maximum [Member] |
Lessee Lease Description [Line Items] |
Lease term range, years | 10 years
Number of renewal options for extended terms | 4 years

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- Definition Number of leases related to ongoing operations. + References No definition available. + Details
Name: | prdo_NumberOfLeasesRelatedToOngoingOperations
Namespace Prefix: | prdo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of subleases. + References No definition available. + Details
Name: | prdo_NumberOfSubleases
Namespace Prefix: | prdo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The year at which the latest operating lease expires as of the balance sheet date. + References No definition available. + Details
Name: | prdo_OperatingLeaseExpirationDate
Namespace Prefix: | prdo_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date which lease or group of leases is set to expire, in YYYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |