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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impairment Charges [Line Items]
Changes in the carrying amount of goodwill	$ 0	$ 0
Carrying values of goodwill	87,356,000	87,356,000
Amortization expense from continuing operations	$ 600,000	800,000	$ 100,000
Maximum [Member]
Impairment Charges [Line Items]
Estimated useful lives of intangible assets, in years	0 years
CTU [Member]
Impairment Charges [Line Items]
Carrying values of goodwill	$ 45,900,000	45,900,000
AIU [Member]
Impairment Charges [Line Items]
Carrying values of goodwill	$ 41,400,000	$ 41,400,000

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Impairment charges.

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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