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Debt - Debt Refinancing and Senior Notes Due 2019 Exchange Transaction (Details)
12 Months Ended
Feb. 01, 2018
Aug. 11, 2017
USD ($)
$ / shares
shares
Apr. 26, 2017
USD ($)
Apr. 21, 2017
USD ($)
Mar. 01, 2017
USD ($)
Apr. 15, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2017
Feb. 06, 2017
$ / shares
Debt Instrument [Line Items]                      
Debt outstanding             $ 3,468,938,000 $ 3,853,012,000      
Deferred financing costs             81,242,000 11,582,000 $ 13,020,000    
Repurchase payments of long term debt             3,038,946,000 1,421,379,000 $ 528,025,000    
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
Senior Secured Credit Facility | Secured Credit Facility                      
Debt Instrument [Line Items]                      
Total senior and other debt             1,625,344,000 1,497,869,000      
Second Amended and Restated Credit Agreement | Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Borrowing under credit facility             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 1,388,036,000      
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             55,799,000 66,081,000      
Total senior and other debt             $ 55,799,000 $ 66,081,000      
Lines of credit | Maximum                      
Debt Instrument [Line Items]                      
Total interest rate             9.51% 20.00%      
Lines of credit | Minimum                      
Debt Instrument [Line Items]                      
Total interest rate             2.50% 1.75%      
Lines of credit | Secured Credit Facility | Walden University                      
Debt Instrument [Line Items]                      
Receivables and intangibles pledged as collateral             $ 411,411,000 $ 409,971,000      
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             $ 1,573,344,000        
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]                      
Percentage of discount rate     1.00%                
Deferred financing costs     $ 16,000,000                
Percentage of amortization of debt discount     1.00%                
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             6.07%        
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Maximum                      
Debt Instrument [Line Items]                      
Basis spread on variable rate     4.50%                
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Maximum | Subsequent Event                      
Debt Instrument [Line Items]                      
Repurchase price, percent 1.00%                    
Basis spread on variable rate 3.50%                    
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     3.50%                
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Minimum | Subsequent Event                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 2.50%                    
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Minimum | London Interbank Offered Rate (LIBOR)                      
Debt Instrument [Line Items]                      
Basis spread on variable rate     4.25%                
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Minimum | Alternate Base Rate (ABR)                      
Debt Instrument [Line Items]                      
Basis spread on variable rate     3.25%