| ACQUISITIONS AND INVESTMENTS - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
| Dec. 31, 2010
 Entity | Nov. 30, 2009
 Unsecured Senior Notes | Aug. 01, 2011
 DataVision Resources | Dec. 31, 2011
 Information Services | Sep. 30, 2010
 Anakam, Inc | Dec. 23, 2009
 Equifax Credit Information Services Private Limited | Nov. 02, 2009
 Rapid Reporting Verification Company | Oct. 27, 2009
 IXI Corporation | |
| Business Acquisition [Line Items] | ||||||||
| Number of Business acquired | 4 | |||||||
| Business acquisition | $ 12.3 | $ 50.0 | $ 82.4 | $ 64.3 | $ 72.5 | $ 124.0 | ||
| Business acquisition, cash consideration | $ 5.2 | |||||||
| Percentage of equity interest acquired | 49.00% | |||||||
| Debt, interest rate | 4.45% | |||||||
| Debt, maturity duration | 5 years | 
| X | ||||||||||
| 
- Definition Debt Instruments, Maturity Duration No definition available. 
 | 
| X | ||||||||||
| 
- Definition Percentage Of Ownership Interests No definition available. 
 | 
| X | ||||||||||
| 
- Definition Amount of cash paid to acquire the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Details 
 | 
| X | ||||||||||
| 
- Definition Interest rate stated in the contractual debt agreement. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
 | 
| X | ||||||||||
| 
- Definition The number of businesses acquired by the entity during the period. No definition available. 
 |