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Leases - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) Lease Facility | Dec. 31, 2018 USD ($)
Lessee Lease Description [Line Items] |  |
Operating leases expiration date | 2028 |
Number of subleases | 5 |
Number of facilities leased | Facility | 4 |
Asset impairment | $ | $ 612 |
Number of leases related to ongoing operations | 11 |
Number of leases related to Closed campuses | 3 |
Continuing Operation [Member] |  |
Lessee Lease Description [Line Items] |  |
Rent expense, exclusive of related taxes,insurance and maintenance costs | $ |  | $ 15,500
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 | 3 years |

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- Definition Lessee, operating sublease, term of contract. + References No definition available. + Details
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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
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- Definition Number of leases related to closed campuses. + References No definition available. + Details
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- Definition Number of leases related to ongoing operations. + References No definition available. + Details
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- Definition Number of subleases. + References No definition available. + Details
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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
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Balance Type: | na
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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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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- 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=121609121&loc=SL77918673-209980 + Details
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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=121609121&loc=SL77918673-209980 + Details
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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=121603541&loc=SL77918638-209977 + Details
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- Details
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- Details
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