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BUSINESS COMBINATIONS (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Jul. 02, 2016 | Jun. 30, 2016 | Jun. 01, 2016 | Dec. 31, 2015 | Dec. 15, 2015
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Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 854,838 |  | $ 588,007 |  | $ 542,994 |
Association Of Certified Anti-Money Laundering Specialists [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Current Assets |  | $ 24,895 |  |  |  |
Property and Equipment |  | 432 |  |  |  |
Other Long-term Assets |  | 3,200 |  |  |  |
Intangible Assets |  | 88,600 |  |  |  |
Goodwill |  | 274,620 |  |  |  |
Total Assets Acquired |  | 391,747 |  |  |  |
Liabilities Assumed |  | 37,619 |  |  |  |
Net Assets Acquired |  | $ 354,128 |  |  |  |
Faculdade de Imperatriz [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Current Assets |  |  |  | $ 1,626 |  |
Property and Equipment |  |  |  | 291 |  |
Intangible Assets |  |  |  | 2,652 |  |
Goodwill |  |  |  | 4,997 |  |
Total Assets Acquired |  |  |  | 9,566 |  |
Liabilities Assumed |  |  |  | 2,756 |  |
Net Assets Acquired |  |  |  | $ 6,810 |  |
Grupo Ibmec Educacional S A [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Current Assets |  |  |  |  |  | $ 27,615
Property and Equipment |  |  |  |  |  | 17,968
Other Long-term Assets |  |  |  |  |  | 2,639
Intangible Assets |  |  |  |  |  | 59,275
Goodwill |  |  |  |  |  | 107,888
Total Assets Acquired |  |  |  |  |  | 215,385
Liabilities Assumed |  |  |  |  |  | 24,423
Net Assets Acquired |  |  |  |  |  | $ 190,962

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