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Revenue Recognition - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Portfolio	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Revenue Recognition [Line Items]
Length of academic year	210 days
Revenue recognized estimated reserve based on historical evidence	$ 2.1	$ 2.3
ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Revenue recognized for payments received from withdrawn students	$ 1.6	$ 1.1	$ 1.2
Number of portfolio for revenue recognition | Portfolio	1
Minimum [Member]
Revenue Recognition [Line Items]
Length of academic terms	56 days
Length of Non-Degree Professional Programs	112 days
Minimum [Member] | ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Days required for documentation to be eligible and approved for funding	90 days
Maximum [Member]
Revenue Recognition [Line Items]
Length of academic terms	84 days
Length of Non-Degree Professional Programs	364 days
Maximum [Member] | ASC Topic 606 [Member]
Revenue Recognition [Line Items]
Days required for documentation to be eligible and approved for funding	120 days

X

- Definition

The average number of days to package certain students that require extensive documentation. Packaging students includes obtaining various types of funding to make payments on the tuition and fees billed for a students certificate or degree program.

+ References

No definition available.

+ Details

Name:	prdo_AverageDaysToPackageCertainStudents
Namespace Prefix:	prdo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The average length of an academic terms for our institutions.

+ References

No definition available.

+ Details

Name:	prdo_AverageLengthOfAcademicTerms
Namespace Prefix:	prdo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Average length of non degree professional programs terms.

+ References

No definition available.

+ Details

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Namespace Prefix:	prdo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The average length of an academic year which is based on the type of institution and program of study.

+ References

No definition available.

+ Details

Name:	prdo_LengthOfAcademicYear
Namespace Prefix:	prdo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of portfolios determined for revenue recognition under ASC Topic 606.

+ References

No definition available.

+ Details

Name:	prdo_NumberOfPortfoliosForRevenueRecognition
Namespace Prefix:	prdo_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

A liability established for situations in which a student withdraws from an institutions and revenue needs to be reversed, based on historical evidence for similar situations.

+ References

No definition available.

+ Details

Name:	prdo_RefundLiabilityReserve
Namespace Prefix:	prdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Revenue Recognition Line Items

+ References

No definition available.

+ Details

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Namespace Prefix:	prdo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of revenue recognized for terminated contracts with students who have withdrawn. Upon withdrawal, collectability is not reasonably assured therefore, revenue is only recognized upon cash collection for these terminated contracts.

+ References

No definition available.

+ Details

Name:	prdo_RevenueRecognizedForWithdrawnStudents
Namespace Prefix:	prdo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Balance Type:
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X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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