Quarterly report pursuant to Section 13 or 15(d)

DEBT (Debt Outstanding - Parenthetical) (Detail)

v2.4.1.9
DEBT (Debt Outstanding - Parenthetical) (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Outstanding [Line Items]    
Debt, maturity date 2017-12  
Notes, 6.30%, due July 2017    
Debt Outstanding [Line Items]    
Debt, interest rate 6.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSixPointThreeZeroPercentDueJulyTwentySeventeenMember 		6.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSixPointThreeZeroPercentDueJulyTwentySeventeenMember
Debt, maturity date 2017-07 2017-07
Notes, 3.30%, due Dec 2022    
Debt Outstanding [Line Items]    
Debt, interest rate 3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesThreePointThreeZeroDueDecemberTwoThousandTwentyTwoMember 		3.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesThreePointThreeZeroDueDecemberTwoThousandTwentyTwoMember
Debt, maturity date 2022-12 2022-12
Debentures, 6.90%, due July 2028    
Debt Outstanding [Line Items]    
Debt, interest rate 6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_DebenturesSixPointNineZeroPercentDueJulyTwentyTwentyEightMember 		6.90%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_DebenturesSixPointNineZeroPercentDueJulyTwentyTwentyEightMember
Debt, maturity date 2028-07 2028-07
Notes, 7.00%, due July 2037    
Debt Outstanding [Line Items]    
Debt, interest rate 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointZeroPercentDueJulyTwentyThirtySevenMember 		7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= efx_NotesSevenPointZeroPercentDueJulyTwentyThirtySevenMember
Debt, maturity date 2037-07 2037-07