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Notes Payable and Other Noncurrent Liabilities - Notes Payable (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Notes Payable through December 2019 [Member]
Line of Credit Facility [Line Items]
Monthly payment of notes payable	$ 556
Interest rate of notes payable	4.10%
Number of days of bank operating rate to calculate interest on notes payable	30 days
Notes Payable through December 2019 [Member] | LIBOR
Line of Credit Facility [Line Items]
Interest rate of notes payable	1.75%
Annuities Extending through 2019 [Member]
Line of Credit Facility [Line Items]
Quarterly payment of notes payable	$ 34
Interest rate of notes payable	10.00%

X

- Definition

Monthly payment of notes payable.

+ References

No definition available.

+ Details

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Namespace Prefix:	lope_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Period for bank operating rate to calculate interest on notes payable.

+ References

No definition available.

+ Details

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Namespace Prefix:	lope_
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Balance Type:	na
Period Type:	duration

X

- Definition

Quarterly payment of notes payable.

+ References

No definition available.

+ Details

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Namespace Prefix:	lope_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Period Type:	instant

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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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Balance Type:	na
Period Type:	duration

X

- Details

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- Details

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- Details

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