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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, January 1, 2018	$ 39,544
Revenue earned from balances existing as of January 1, 2018	(34,201)
Billings during period	153,227
Revenue earned for new billings during the period	(113,309)
Other adjustments	321
Gross deferred revenue, March 31, 2018	45,582
University Group [Member] | CTU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, January 1, 2018	23,933
Revenue earned from balances existing as of January 1, 2018	(20,623)
Billings during period	93,896
Revenue earned for new billings during the period	(73,485)
Other adjustments	304
Gross deferred revenue, March 31, 2018	24,025
University Group [Member] | AIU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, January 1, 2018	15,507
Revenue earned from balances existing as of January 1, 2018	(13,540)
Billings during period	58,935
Revenue earned for new billings during the period	(39,531)
Other adjustments	44
Gross deferred revenue, March 31, 2018	21,415
All Other Campuses [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, January 1, 2018	104
Revenue earned from balances existing as of January 1, 2018	(38)
Billings during period	396
Revenue earned for new billings during the period	(293)
Other adjustments	(27)
Gross deferred revenue, March 31, 2018	$ 142

X

- Definition

For the current period, the amount of new charges billed to customers for services to be provided for the current academic term.

+ References

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The amount of other adjustments to the deferred revenue balance during the current period.

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- Definition

The gross amount of deferred revenue before offsetting with any contract asset balances.

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- Definition

Amount of deferred revenue recognized for transactions arising during the current reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an Entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 13.A.3)
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response))
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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