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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
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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 |  |

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