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The Transaction - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Jul. 01, 2018
Sep. 30, 2018
Sep. 30, 2018
Long Lived Assets Held-for-sale [Line Items]      
Loss on transaction   $ (15,610,000) $ (17,600,000)
Asset impairment $ 3,037,000    
Grand Canyon University [Member]      
Long Lived Assets Held-for-sale [Line Items]      
Cash transferred     34,107,000
Loss on transaction due to transaction costs     4,995,000
Loss on transaction     (17,600,000)
Asset impairment     3,037,000
Recognized deferred compensation plan expense for former GCE employees   $ 9,568,000 9,568,000
Share-based compensation expense     7,880,000
Employer tax expense related to share-based compensation     191,000
Share-based compensation modification, net of reversals of employee related liabilities     $ 1,502,000
Grand Canyon University [Member] | Asset Purchase Agreement [Member]      
Long Lived Assets Held-for-sale [Line Items]      
Purchase price of assets 870,097,000    
Final purchase price adjustment amount $ 1.00    
Senior secured note bears interest 6.00%    
Senior secured notes maturity date     Jun. 30, 2025
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 period 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