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Leases - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2019 Lease Facility | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Lessee Lease Description [Line Items] |  |  |
Operating leases expiration date | 2028 |  |
Number of subleases | 8 |  |
Number of facilities leased | Facility | 6 |  |
Number of leases related to ongoing operations | 9 |  |
Number of leases related to Closed campuses | 6 |  |
Continuing Operation [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Rent expense, exclusive of related taxes,insurance and maintenance costs | $ |  | $ 15.5 | $ 28.1
Minimum [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Lease term range, years | 5 years |  |
Number of renewal options for extended terms | 1 year |  |
Operating sublease term | 1 year |  |
Maximum [Member] |  |  |
Lessee Lease Description [Line Items] |  |  |
Lease term range, years | 10 years |  |
Number of renewal options for extended terms | 4 years |  |
Operating sublease term | 4 years |  |

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- Definition Lessee, operating sublease, term of contract. + References No definition available. + Details
Name: | prdo_LesseeOperatingSubleaseTermOfContract
Namespace Prefix: | prdo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of leased facilities which have a sublease tenant. + References No definition available. + Details
Name: | prdo_NumberOfLeasedFacilitiesWhichAreSubleased
Namespace Prefix: | prdo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Number of leases related to ongoing operations. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
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- Definition Number of subleases. + 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 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

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- 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
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- 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=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |