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Intangible Assets - Estimated Aggregate Amortization Expense (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
2015 $ 214.6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016 208.5us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 198.7us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 187.2us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 173.6us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Total $ 982.6ajg_FutureAmortizationExpenseOfFiscalYear