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Nature of Business - Additional Information (Detail) - Grand Canyon University [Member]	12 Months Ended
	Dec. 31, 2018 item
Nature Of Operations [Line Items]
Description of area of campus in Phoenix, Arizona	262 acre campus
Number of colleges in Phoenix, Arizona	9
Number of degree programs and certificates	240

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Number of colleges.

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Number of degree programs offered.

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Real estate property description.

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