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BENEFIT PLANS (Additional Information) (Detail) shares in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 21, 2012 USD ($) participant | Dec. 31, 2016 | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) | Sep. 30, 2015 | Dec. 31, 2012 participant
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Number of Vested Participants | participant |  |  |  |  |  |  | 3,500
Percentage of Employees Received Lump Sum Payment | 64.00% |  |  |  |  |  |
Benefits paid | $ 62.6 |  |  |  |  |  |
Defined Benefit Plan, Number of Vested Participants Who Elected The Monthly Annuity | participant | 90 |  |  |  |  |  |
Defined Benefit Plan Increase To The Service Benefit |  |  |  |  |  | 9.00% |
Employer contributions to retirement income plan |  |  | $ 23.9 | $ 21.5 | $ 21.3 |  |
Accumulated benefit obligation |  |  | $ 653.8 | 727.8 |  |  |
Pension Plans investment return |  |  | 1.10% |  |  |  |
Defined benefit plan expected return |  |  | 7.50% |  |  |  |
Difference between actual returns and expected returns rate over five years period |  |  | 20.00% |  |  |  |
Defined Benefit Plan, Narrative Description of Basis Used to Determine Overall Expected Long-term Rate-of-Return on Assets Assumption |  |  | The market-related value of assets recognizes the difference between actual returns and expected returns over five years |  |  |  |
Accrued incentive compensations |  |  | $ 83.1 | $ 60.7 |  |  |
Stock held by employee benefits trusts, shares | shares |  |  | 0.6 | 0.6 |  |  |
Shares of Equifax stock included in Employee Benefit Trusts at cost |  |  | $ 5.9 | $ 5.9 |  |  |
U.S. Defined Benefit Plans |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan Percentage Of Employees Covered |  |  | 20.00% |  |  |  |
U.S. Retirement Income Plan, or USRIP |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation |  |  | $ 613.1 | 679.5 |  |  |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation |  |  | 611.1 | 676.8 |  |  |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets |  |  | $ 474.6 | 515.6 |  |  |
Initial annual rate increase in the per capita cost of of covered healthcare benefits |  |  | 7.00% |  |  |  |
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits |  |  | 5.00% |  |  |  |
Defined Benefit Plan, Expected Return On Plan Assets Percentage |  | 7.30% |  |  |  |  |
Canadian Retirement Income Plan, or CRIP |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Employer contributions to retirement income plan |  |  | $ 0.2 | 1.2 |  |  |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, projected benefit obligation |  |  | 49.6 | 59.6 |  |  |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, accumulated benefit obligation |  |  | 42.7 | 51.0 |  |  |
Plans with projected benefit obligations and accumulated benefits benefit obligations in excess of plan's respective assets, fair value of plan assets |  |  | $ 44.3 | 54.5 |  |  |
Pension Plans investment return |  |  | 2.90% |  |  |  |
Initial annual rate increase in the per capita cost of of covered healthcare benefits |  |  | 6.50% |  |  |  |
Ultimate annual rate decrease in the per capita cost of of covered healthcare benefits |  |  | 5.00% |  |  |  |
Defined Benefit Plan, Expected Return On Plan Assets Percentage |  | 6.00% | 6.75% |  |  |  |
Other Benefits |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Benefits paid |  |  | $ 2.4 | 2.1 |  |  |
Employer contributions to retirement income plan |  |  | $ 1.8 | $ 1.6 |  |  |

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