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Summary of Significant Accounting Policies - Additional Information (Detail)
shares in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2018
USD ($)
Jun. 30, 2018
USD ($)
employee
shares
May 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
project
Agency
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Summary Of Significant Accounting Policies [Line Items]                  
Average days from the date of receipt in which funds remain as restricted cash and cash equivalents             60 to 90 days    
Loss in investment interest and other             $ 372    
Capitalized interest rate on borrowings to finance improvements             3.70% 2.80% 2.20%
Property and equipment, useful life             15 years    
Royalty amortization period             20 years    
Remaining prepaid royalty assets impaired $ 3,037                
Reserve for uncertain tax positions including interest and penalties             $ 1,960 $ 2,008  
Reduction in revenue due to scholarships offered to students           $ 101,176   196,334 $ 179,230
Lease termination costs       $ 160 $ 3,363        
Cumulative effect from the adoption of accounting pronouncements, net of taxes             $ 1,174    
Deferred revenue               46,895  
Amortization of other current assets             next twelve month    
Period of LIBOR interest rate             30 days    
Number of stages of software development projects | project             3    
Computer Software, Intangible Asset [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Estimated useful life             3 years    
Grand Canyon University [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Remaining prepaid royalty assets impaired             $ 3,037    
Number of former employees hired   100 100            
Share-based compensation expense for restricted stock awards             $ 7,880    
Grand Canyon University [Member] | Restricted Stock Grants [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Shares issued under plan | shares   82 82,027            
Share-based compensation expense for restricted stock awards   $ 7,880 $ 7,880            
Grand Canyon University [Member] | Master Services Agreement [Member]                  
Summary Of Significant Accounting Policies [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    
Refund or return rights under agreement             $ 0    
Interest Rate Corridor [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Notional amount of derivative instrument             $ 60,000    
Description of interest rate risk hedge at several thresholds             the Company pays variable interest monthly based on the 30-day LIBOR rates until that index reaches 1.5%. If 30-day LIBOR is equal to 1.5% through 3.0%, the Company pays 1.5%. If 30-day LIBOR exceeds 3.0%, the Company pays actual 30-day LIBOR less 1.5%.    
Interest Rate Corridor [Member] | LIBOR                  
Summary Of Significant Accounting Policies [Line Items]                  
Maximum percentage of variable interest rates based on LIBOR             1.50%    
Percentage of amount paid by Company             1.50%    
Percentage deducted from LIBOR for actual payment             1.50%    
Other Assets [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Fair values of interest rate corridor instrument             $ 600 $ 509  
Furniture, Fixtures and Equipment [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment, useful life             10 years    
Computer Equipment [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment, useful life             4 years    
Vehicles [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment, useful life             5 years    
Minimum                  
Summary Of Significant Accounting Policies [Line Items]                  
Number of days from the date of receipt in which funds remain as restricted cash and cash equivalents             60 days    
Number of major rating agencies reporting credit ratings | Agency             1    
Minimum | Interest Rate Corridor [Member] | LIBOR                  
Summary Of Significant Accounting Policies [Line Items]                  
Percentage of LIBOR             1.50%    
Minimum | Land Improvements and Buildings [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment, useful life             10 years    
Maximum                  
Summary Of Significant Accounting Policies [Line Items]                  
Number of days from the date of receipt in which funds remain as restricted cash and cash equivalents             90 days    
Maximum | Interest Rate Corridor [Member] | LIBOR                  
Summary Of Significant Accounting Policies [Line Items]                  
Percentage of LIBOR             3.00%    
Maximum | Land Improvements and Buildings [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Property and equipment, useful life             40 years    
Revenue from Contracts with Customers [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                  
Summary Of Significant Accounting Policies [Line Items]                  
Direct and incremental capitalized costs             $ 9,015    
Deferred revenue             $ 7,451