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Nature of Business - Additional Information (Detail)	12 Months Ended
Nature of Business - Additional Information (Detail)	Dec. 31, 2017 Degrees Colleges
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of area of the company's campus in Phoenix, Arizona	275 acre campus
Number of colleges in Phoenix, Arizona \| Colleges	9
Number of degree programs and certificates \| Degrees	225