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Credit and Other Debt Agreements - Summary of Corporate and Other Debt (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fixed Rate of 6.26%, Balloon Due 2014 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 6.26%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfSixPointTwoSixPercentBalloonDueTwoThousandFourteenMember		 6.26%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfSixPointTwoSixPercentBalloonDueTwoThousandFourteenMember
Principal payments, year due 2014 2014
Fixed Rate of 6.44%, Balloon Due 2017 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 6.44%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfSixPointFourFourPercentBalloonDueTwoThousandSeventeenMember		 6.44%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfSixPointFourFourPercentBalloonDueTwoThousandSeventeenMember
Principal payments, year due 2017 2017
Fixed Rate of 2.80%, Balloon Due 2018 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 2.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfTwoPointEightZeroPercentBalloonDueTwoThousandEighteenMember		 2.80%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfTwoPointEightZeroPercentBalloonDueTwoThousandEighteenMember
Principal payments, year due 2018 2018
Fixed Rate of 3.20%, Balloon Due 2019 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 3.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfThreePointTwoZeroPercentBalloonDueTwoThousandNineteenMember		 3.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfThreePointTwoZeroPercentBalloonDueTwoThousandNineteenMember
Principal payments, year due 2019 2019
Fixed Rate of 5.85%, $50.0 Million Due in 2016, 2018 and 2019 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueTwoThousandSixteenTwoThousandEighteenAndTwoThousandNineteenMember		 5.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueTwoThousandSixteenTwoThousandEighteenAndTwoThousandNineteenMember
Long-Term debt maturities repayments in 2016 50us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueTwoThousandSixteenTwoThousandEighteenAndTwoThousandNineteenMember		 50us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueTwoThousandSixteenTwoThousandEighteenAndTwoThousandNineteenMember
Long-Term debt maturities repayments in 2018 50.0ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueTwoThousandSixteenTwoThousandEighteenAndTwoThousandNineteenMember		 50.0ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueTwoThousandSixteenTwoThousandEighteenAndTwoThousandNineteenMember
Long-Term debt maturities repayments in 2019 50ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueTwoThousandSixteenTwoThousandEighteenAndTwoThousandNineteenMember		 50ajg_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSeven
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointEightFivePercentFiftyMillionDollarsDueTwoThousandSixteenTwoThousandEighteenAndTwoThousandNineteenMember
Fixed Rate of 5.85%, $50.0 Million Due in 2016, 2018 and 2019 [Member] | First Installment [Member]    
Debt Instrument [Line Items]    
Principal payments, year due 2016 2016
Fixed Rate of 5.85%, $50.0 Million Due in 2016, 2018 and 2019 [Member] | Second Installment [Member]    
Debt Instrument [Line Items]    
Principal payments, year due 2018 2018
Fixed Rate of 5.85%, $50.0 Million Due in 2016, 2018 and 2019 [Member] | Third Installment [Member]    
Debt Instrument [Line Items]    
Principal payments, year due 2019 2019
Fixed Rate of 3.99%, Balloon Due 2020 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 3.99%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfThreePointNineNinePercentBalloonDueTwoThousandTwentyMember		 3.99%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfThreePointNineNinePercentBalloonDueTwoThousandTwentyMember
Principal payments, year due 2020 2020
Fixed Rate of 3.48%, Balloon Due 2020 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 3.48%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfThreePointFourEightPercentBalloonDueTwoThousandTwentyMember		 3.48%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfThreePointFourEightPercentBalloonDueTwoThousandTwentyMember
Principal payments, year due 2020 2020
Fixed Rate of 5.18%, Balloon Due 2021 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 5.18%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointOneEightPercentBalloonDueTwoThousandTwentyOneMember		 5.18%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointOneEightPercentBalloonDueTwoThousandTwentyOneMember
Principal payments, year due 2021 2021
Fixed rate of 3.69%, Balloon Due 2022 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 3.69%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfThreePointSixNinePercentBalloonDueTwoThousandTwentyTwoMember		 3.69%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfThreePointSixNinePercentBalloonDueTwoThousandTwentyTwoMember
Principal payments, year due 2022 2022
Fixed Rate of 5.49%, Balloon Due 2023 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 5.49%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointFourNinePercentBalloonDueTwoThousandTwentyThreeMember		 5.49%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFivePointFourNinePercentBalloonDueTwoThousandTwentyThreeMember
Principal payments, year due 2023 2023
Fixed Rate of 4.13%, Balloon Due 2023 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 4.13%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointOneThreePercentageBalloonDueTwoThousandTwentyThreeMember		 4.13%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointOneThreePercentageBalloonDueTwoThousandTwentyThreeMember
Principal payments, year due 2023 2023
Fixed Rate of 4.58% Balloon Due 2024 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 4.58%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointFiveEightPercentBalloonDueTwoThousandTwentyFourMember		 4.58%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointFiveEightPercentBalloonDueTwoThousandTwentyFourMember
Principal payments, year due 2024 2024
Fixed Rate of 4.31%, Balloon Due 2025 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 4.31%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointThreeOnePercentBalloonDueTwoThousandTwentyFiveMember		 4.31%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointThreeOnePercentBalloonDueTwoThousandTwentyFiveMember
Principal payments, year due 2025 2025
Fixed Rate of 4.73% Balloon Due 2026 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 4.73%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointSevenThreePercentBalloonDueTwoThousandTwentySixMember		 4.73%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointSevenThreePercentBalloonDueTwoThousandTwentySixMember
Principal payments, year due 2026 2026
Fixed Rate of 4.36%, Balloon Due 2026 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 4.36%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointThreeSixPercentBalloonDueTwoThousandTwentySixMember		 4.36%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointThreeSixPercentBalloonDueTwoThousandTwentySixMember
Principal payments, year due 2026 2026
Fixed Rate of 4.98% Balloon Due 2029 [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 4.98%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointNineEightPercentBalloonDueTwoThousandTwentyNineMember		 4.98%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_FixedRateOfFourPointNineEightPercentBalloonDueTwoThousandTwentyNineMember
Principal payments, year due 2029 2029
Prime or LIBOR plus up to 1.45%, expires September 19, 2018 [Member] | Credit Agreement [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 1.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresSeptemberNineteenTwoThousandEighteenMember
/ us-gaap_LineOfCreditFacilityAxis
= ajg_CreditAgreementMember		 1.45%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_PrimeOrLiborPlusUpToOnePointFourFivePercentExpiresSeptemberNineteenTwoThousandEighteenMember
/ us-gaap_LineOfCreditFacilityAxis
= ajg_CreditAgreementMember
Periodic payments of interest and principal, expiry date Sep. 19, 2018 Sep. 19, 2018
Premium Financing Debt Facility [Member]    
Debt Instrument [Line Items]    
Periodic payments of interest and principal, expiry date Jun. 15, 2016 Jun. 15, 2016
Premium Financing Debt Facility [Member] | Interbank rates plus 1.65%, Expires June 15, 2016 [Member] | Facility B [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 1.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ajg_FacilityBMember
/ us-gaap_DebtSecurityAxis
= ajg_PremiumFinancingDebtFacilityMember
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_InterbankRatesPlusOnePointSixFivePercentExpiresJuneFifteenTwoThousandSixteenMember		 1.65%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ajg_FacilityBMember
/ us-gaap_DebtSecurityAxis
= ajg_PremiumFinancingDebtFacilityMember
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_InterbankRatesPlusOnePointSixFivePercentExpiresJuneFifteenTwoThousandSixteenMember
Premium Financing Debt Facility [Member] | Interbank rates plus 0.85%, Expires June 15, 2016 [Member] | Facility C and D [Member]    
Debt Instrument [Line Items]    
Periodic Payment of Interest 0.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ajg_FacilityCAndFaciltiyDMember
/ us-gaap_DebtSecurityAxis
= ajg_PremiumFinancingDebtFacilityMember
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_InterbankRatesPlusZeroPointEightFivePercentExpiresJuneFifteenTwoThousandSixteenMember		 0.85%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ajg_FacilityCAndFaciltiyDMember
/ us-gaap_DebtSecurityAxis
= ajg_PremiumFinancingDebtFacilityMember
/ us-gaap_ExtinguishmentOfDebtAxis
= ajg_InterbankRatesPlusZeroPointEightFivePercentExpiresJuneFifteenTwoThousandSixteenMember