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Debt - Debt Refinancing and Senior Notes Due 2019 Exchange Transaction (Details)
12 Months Ended
Feb. 01, 2019
USD ($)
Feb. 01, 2018
USD ($)
Aug. 11, 2017
USD ($)
$ / shares
shares
Apr. 26, 2017
USD ($)
Apr. 21, 2017
USD ($)
Mar. 01, 2017
USD ($)
Apr. 15, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2017
Feb. 06, 2017
$ / shares
Debt Instrument [Line Items]                        
Debt outstanding               $ 2,783,692,000 $ 3,200,565,000      
Deferred financing costs               513,000 81,097,000 $ 11,559,000    
Repurchase payments of long term debt               867,915,000 3,038,946,000 $ 1,421,379,000    
Class A Common Stock                        
Debt Instrument [Line Items]                        
Required amount of proceeds received in public offering for exchange agreement to occur             $ 400,000,000          
Gross proceeds from initial public offering, percent of equity value             10.00%          
Class A Common Stock | IPO                        
Debt Instrument [Line Items]                        
Sale price of common stock in IPO (in dollars per share) | $ / shares     $ 14.00                 $ 14.00
Revolving Credit Facility and Term Loan | Subsequent Event                        
Debt Instrument [Line Items]                        
Repayments of debt $ 340,000,000                      
Senior Secured Credit Facility | Secured Credit Facility                        
Debt Instrument [Line Items]                        
Total senior and other debt               $ 1,321,629,000 $ 1,625,344,000      
Second Amended and Restated Credit Agreement | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Interest rate               8.25% 7.25%      
Borrowing under credit facility               $ 93,500,000 $ 52,000,000      
Second Amended and Restated Credit Agreement | Letter of Credit                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity under credit facility       $ 141,000,000                
Second Amended and Restated Credit Agreement | Revolving Credit Facility and Term Loan                        
Debt Instrument [Line Items]                        
Incremental borrowing capacity       $ 300,000,000                
Debt to consolidated EBITDA ratio       275.00%                
Senior Notes                        
Debt Instrument [Line Items]                        
Total senior and other debt               800,000,000 800,000,000      
Senior Notes | Senior Notes Due 2019                        
Debt Instrument [Line Items]                        
Interest rate                     9.25%  
Amount of debt to be exchanged             $ 250,000,000          
Repurchase price, percent     104.625%                  
Debt outstanding     $ 1,125,443,000                  
Redemption price     1,177,495,000                  
Principal amount redeemed     $ 1,205,630,000                  
Shares converted (in shares) | shares     18,683,000                  
Common stock shares issuable, percentage of aggregate principal amount     104.625%                  
Amount to be divided by initial public offering price per share, to determine number of shares authorized for exchange     $ 261,600,000                  
Payment for interest and special interest accrued     $ 11,100,000                  
Period for repurchase of additional principal amount             60 days          
Amount able to be purchased after IPO             $ 62,500,000          
Repurchase of aggregate principal amount           $ 22,556,000            
Repurchase payments of long term debt           $ 23,599,000            
Senior Notes | The Senior Notes due 2025                        
Debt Instrument [Line Items]                        
Debt outstanding       $ 800,000,000                
Senior Notes | The Senior Notes due 2025 | Debt Instrument, Redemption, Period One                        
Debt Instrument [Line Items]                        
Interest rate       8.25%                
Repurchase price, percent       106.188%                
Senior Notes | The Senior Notes due 2025 | Debt Instrument, Redemption, Period Two                        
Debt Instrument [Line Items]                        
Repurchase price, percent       100.00%                
Senior Notes | The Senior Notes due 2025 | Debt Instrument, Redemption, Period Three                        
Debt Instrument [Line Items]                        
Repurchase price, percent       108.25%                
Percentage of principal amount redeemed       40.00%                
Senior Notes | The Senior Notes due 2025 | Debt Instrument, Redemption, Period Four                        
Debt Instrument [Line Items]                        
Repurchase price, percent       100.00%                
Convertible Debt | Exchanged Notes                        
Debt Instrument [Line Items]                        
Amount of debt to be exchanged         $ 250,000,000              
Deferred financing costs                 70,800,000      
Lines of credit                        
Debt Instrument [Line Items]                        
Debt outstanding               37,899,000 42,195,000      
Total senior and other debt               $ 37,899,000 $ 42,195,000      
Lines of credit | Maximum                        
Debt Instrument [Line Items]                        
Total interest rate               11.00% 9.51%      
Lines of credit | Minimum                        
Debt Instrument [Line Items]                        
Total interest rate               6.50% 6.50%      
Lines of credit | Secured Credit Facility | Walden University                        
Debt Instrument [Line Items]                        
Receivables and intangibles pledged as collateral               $ 403,658,000 $ 411,411,000      
Lines of credit | Secured Credit Facility | United States Guarantors                        
Debt Instrument [Line Items]                        
Percentage of collateral pledged (no more than)                 65.00%      
Lines of credit | New Credit Agreement | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity under credit facility       $ 385,000,000                
Lines of credit | New Credit Facilities | Term Loan                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity under credit facility       $ 1,600,000,000                
Borrowing under credit facility               $ 1,228,129,000 $ 1,573,344,000      
Lines of credit | Senior Secured Credit Facility | Term Loan                        
Debt Instrument [Line Items]                        
Amount of debt converted                 $ 283,000,000      
Lines of credit | Second Amended and Restated Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       3.50%                
Lines of credit | Second Amended and Restated Credit Agreement | Revolving Credit Facility | Alternate Base Rate (ABR)                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       2.50%                
Lines of credit | Second Amended and Restated Credit Agreement | Revolving Credit Facility | Maximum                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       3.75%                
Lines of credit | Second Amended and Restated Credit Agreement | Revolving Credit Facility | Minimum                        
Debt Instrument [Line Items]                        
Basis spread on variable rate       2.75%                
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan                        
Debt Instrument [Line Items]                        
Repayments of debt   $ 350,000,000                    
Percentage of discount rate       1.00%                
Deferred financing costs       $ 16,000,000                
Repurchase payments of long term debt   $ 350,000,000                    
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Debt Instrument, Covenant, Period One                        
Debt Instrument [Line Items]                        
Percentage of principal amount outstanding prepayment       101.00%                
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Debt Instrument, Covenant, Period Two                        
Debt Instrument [Line Items]                        
Percentage of principal amount outstanding prepayment       100.00%                
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Total interest rate               6.03% 6.07%      
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Maximum                        
Debt Instrument [Line Items]                        
Repurchase price, percent   1.00%                    
Basis spread on variable rate   3.50%   4.50%                
Decrease in basis spread on variable rate   0.01                    
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Minimum                        
Debt Instrument [Line Items]                        
Basis spread on variable rate   2.50%   3.50%