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Revenue Recognition - Changes in Deferred Revenue Balances (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2018	Sep. 30, 2018
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		$ 37,260	$ 39,544
Revenue earned from balances existing		(32,921)	(36,606)
Billings during period	[1]	167,192	453,176
Revenue earned for new billings during the period		(111,961)	(397,130)
Other adjustments		(791)	(205)
Gross deferred revenue, ending balance		58,779	58,779
University Group [Member] | CTU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		23,754	23,933
Revenue earned from balances existing		(21,533)	(22,192)
Billings during period	[1]	93,277	279,374
Revenue earned for new billings during the period		(70,837)	(256,923)
Other adjustments		(266)	203
Gross deferred revenue, ending balance		24,395	24,395
University Group [Member] | AIU [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		13,436	15,507
Revenue earned from balances existing		(11,341)	(14,310)
Billings during period	[1]	73,852	173,244
Revenue earned for new billings during the period		(41,106)	(139,736)
Other adjustments		(500)	(364)
Gross deferred revenue, ending balance		34,341	34,341
All Other Campuses [Member]
Deferred Revenue Arrangement [Line Items]
Gross deferred revenue, beginning balance		70	104
Revenue earned from balances existing		(47)	(104)
Billings during period	[1]	63	558
Revenue earned for new billings during the period		(18)	(471)
Other adjustments		(25)	(44)
Gross deferred revenue, ending balance		$ 43	$ 43
[1] Billings during period includes adjustments for prior billings.

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- Definition

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

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- Definition

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.

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

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