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Significant Accounting Policies - Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
entity
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues $ 285,219 $ 243,523 $ 303,856 $ 192,319 $ 351,846 $ 277,267 $ 370,938 $ 212,019 $ 1,024,917 $ 1,212,070 $ 1,144,574
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax 623,135 $ (513,390) $ (300,069) $ (107,780) (616) $ (10,145) $ 685,694 $ 413,214      
Receivables deemed uncollectible, period                 2 years    
Deferred online course development costs 15,258       22,326       $ 15,258 22,326  
Deferred accreditation costs 241       287       241 287  
Deferred costs, gross 33,361       39,465       33,361 39,465  
Accumulated amortization of deferred costs 15,738       14,761       15,738 14,761  
Unamortized balances of deferred financing costs 53,292       62,911       53,292 62,911  
Advertising costs                 45,318 53,819 52,537
Operating lease right-of-use assets, net 462,767       521,764       462,767 521,764  
Operating lease liabilities $ 519,138               $ 519,138    
Finite-Lived Intangible Assets                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Estimated useful life (in years)   5 years                  
Variable Interest Entity, Primary Beneficiary                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Number of consolidated entities (entity) | entity                 1    
Minimum                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Contract cost, amortization period 2 years               2 years    
Maximum                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Contract cost, amortization period 4 years               4 years    
Peru                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Revenues                 $ 482,819 545,291 $ 493,008
Undistributed foreign earnings         100         100  
Commission and Bonuses                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Capitalized contract cost, net $ 2,124       $ 2,091       $ 2,124 $ 2,091