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1111 - Disclosure - Accumulated Other Comprehensive Earnings - Schedule of Accumulated Other Comprehensive Earnings (Loss) Attributable to Controlling Interests (Detail)
(http://www.ajg.com/taxonomy/role/DisclosureAccumulatedOtherComprehensiveEarningsScheduleOfAccumulatedOtherComprehensiveEarningsLossAttributableToControllingInterests)
TableAccumulated Other Comprehensive Income (Loss) [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000354190 (http://www.sec.gov/CIK)
Accumulated Other Comprehensive Income (Loss) [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Equity Components [Axis]Equity Components [Axis]Equity Components [Axis]
Pension Liability [Member]Foreign Currency Translation [Member]Fair Value of Derivative Instruments [Member]Accumulated Other Comprehensive Earnings (Loss) [Member]Equity Component [Domain]Pension Liability [Member]Foreign Currency Translation [Member]Fair Value of Derivative Instruments [Member]Accumulated Other Comprehensive Earnings (Loss) [Member]Equity Component [Domain]Pension Liability [Member]Foreign Currency Translation [Member]Fair Value of Derivative Instruments [Member]Accumulated Other Comprehensive Earnings (Loss) [Member]
Beginning Balance
(42,900,000) 
(477,400,000) 
(2,200,000) 
(522,500,000) 
(522,500,000) 
(44,200,000) 
(216,300,000) 
(100,000) 
(260,600,000) 
 
(25,600,000) 
22,100,000  
900,000  
(2,600,000) 
Net change in period
(4,400,000) 
(231,800,000) 
(4,900,000) 
(241,100,000) 
 
1,300,000  
(261,100,000) 
(2,100,000) 
(261,900,000) 
 
(18,600,000) 
(238,400,000) 
(1,000,000) 
(258,000,000) 
Ending Balance
(47,300,000) 
 
(709,200,000) 
 
(7,100,000) 
 
(763,600,000) 
 
(763,600,000) 
 
(42,900,000) 
 
(477,400,000) 
 
(2,200,000) 
 
(522,500,000) 
 
(522,500,000) 
 
(44,200,000) 
 
(216,300,000) 
 
(100,000) 
 
(260,600,000)