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Acquisitions (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
May 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 686,805 $ 687,256   $ 627,594
OnCourse Learning [Member]        
Business Acquisition [Line Items]        
Current Assets     $ 5,260  
Property and Equipment     1,197  
Intangible Assets     63,100  
Goodwill     59,427  
Total Assets Acquired     128,984  
Liabilities Assumed     9,445  
Net Assets Acquired     $ 119,539