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Subsequent Event and Assets and Liabilities Held for Sale - Additional Information (Detail) - USD ($)		6 Months Ended
	Jul. 01, 2018	Jun. 30, 2018	Jun. 30, 2017
Long Lived Assets Held-for-sale [Line Items]
Share-based compensation expense		$ 6,734,000	$ 6,229,000
Grand Canyon University [Member] | Subsequent Event [Member]
Long Lived Assets Held-for-sale [Line Items]
Cash transferred	$ 43,475,000
Transactions costs incurred	23,700,000
Share-based compensation expense	17,446,000
Asset impairment	3,037,000
Grand Canyon University [Member] | Asset Purchase Agreement [Member]
Long Lived Assets Held-for-sale [Line Items]
Senior secured notes maturity date		Jun. 30, 2025
Grand Canyon University [Member] | Asset Purchase Agreement [Member] | Subsequent Event [Member]
Long Lived Assets Held-for-sale [Line Items]
Purchase price of assets	869,120
Base purchase price adjustment amount	$ 1
Senior secured note bears interest	6.00%
Grand Canyon University [Member] | Master Services Agreement [Member]
Long Lived Assets Held-for-sale [Line Items]
Percentage of tuition and fee revenue used for closing of purchase agreement		60.00%
Initial maturity periid of agreement		15 years
Early termination period of agreement		7 years
Percentage of termination fee		100.00%
Termination fees payment period		12 months
Percentage of non-renewal fees payment		50.00%
Non-renewal fees payment period		12 months

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