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BUSINESS COMBINATIONS (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Feb. 05, 2018
Dec. 31, 2017
Nov. 01, 2017
Business Acquisition [Line Items]          
Goodwill $ 813,176 $ 813,887   $ 832,943  
Sao Judas Tadeu [Member]          
Business Acquisition [Line Items]          
Current Assets         $ 558
Property and Equipment         64
Other Long-term Assets         9
Intangible Assets         381
Goodwill         5,636
Total Assets Acquired         6,648
Liabilities Assumed         684
Net Assets Acquired         $ 5,964
Edupristine [Member]          
Business Acquisition [Line Items]          
Current Assets     $ 866    
Property and Equipment     239    
Other Long-term Assets     69    
Intangible Assets     1,380    
Goodwill     11,527    
Total Assets Acquired     14,081    
Liabilities Assumed     2,715    
Net Assets Acquired     $ 11,366