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BUSINESS COMBINATIONS (Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Nov. 01, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Jul. 02, 2016
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 832,943 |  | $ 829,086 | $ 832,642 |
Association Of Certified Anti-Money Laundering Specialists [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current Assets |  |  |  |  | $ 24,895
Property and Equipment |  |  |  |  | 432
Other Long-term Assets |  |  |  |  | 3,131
Intangible Assets |  |  |  |  | 88,600
Goodwill |  |  |  |  | 274,689
Total Assets Acquired |  |  |  |  | 391,747
Liabilities Assumed |  |  |  |  | 37,619
Net Assets Acquired |  |  |  |  | $ 354,128
Sao Judas Tadeu [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current Assets |  | $ 558 |  |  |
Property and Equipment |  | 16 |  |  |
Other Long-term Assets |  | 1,838 |  |  |
Goodwill |  | 4,121 |  |  |
Total Assets Acquired |  | 6,533 |  |  |
Liabilities Assumed |  | 569 |  |  |
Net Assets Acquired |  | $ 5,964 |  |  |

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