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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Receivables [Abstract] |  |  |  |
Balance, Beginning of Period | $ 39,044 | $ 30,730 | $ 31,964 | $ 24,836
Beginning balance related to business acquisition |  |  | 2,174 |
Provision for credit losses | 11,519 | 8,888 | 36,706 | 32,042
Amounts Written-off | (10,479) | (11,202) | (32,213) | (29,888)
Recoveries | 637 | 581 | 2,090 | 2,007
Balance, End of Period | $ 40,721 | $ 28,997 | $ 40,721 | $ 28,997

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

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- Definition Allowance for Credit Loss balance related to business acquisition. + References No definition available. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130534-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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=121599337&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=120395209&loc=SL114868664-224227 + Details
Name: | us-gaap_ProvisionForDoubtfulAccounts
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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