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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Receivables [Abstract] |  |
Balance, Beginning of Period | $ 31,964 | $ 24,836
Beginning balance related to business acquisition | 2,174 |
Provision for credit losses | 12,862 | 11,722
Amounts Written-off | (11,601) | (9,499)
Recoveries | 696 | 870
Balance, End of Period | $ 36,095 | $ 27,929

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- Definition Amount of increase in allowance for credit loss on student receivable, from recovery. + References No definition available. + Details
Name: | prdo_AllowanceForCreditLossReceivableRecoveries
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of direct write-downs of student receivable charged against the allowance. + References No definition available. + Details
Name: | prdo_AllowanceForCreditLossReceivableWriteOffs
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional. + References No definition available. + Details
Name: | prdo_ContractWithCustomerReceivableAllowanceForCreditLoss
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Allowance for Credit Loss balance related to business acquisition. + References No definition available. + Details
Name: | prdo_ContractWithCustomerReceivableAllowanceForCreditLossRelatedToBusinessAcquisition
Namespace Prefix: | prdo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
Name: | us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration