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2407403 - Disclosure - Employee Benefit Plans - Changes in Benefit Obligation (Detail)
(http://www.genpt.com/role/EmployeeBenefitPlansChangesInBenefitObligationDetail)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000040987 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Changes in benefit obligation
 
 
 
Benefit obligation at beginning of year
2,199,356,000  
2,352,094,000  
 
Service cost
7,746,000  
8,562,000  
7,824,000  
Interest cost
104,485,000  
98,088,000  
102,465,000  
Plan participants’ contributions
2,585,000  
2,838,000  
 
Actuarial loss (gain)
139,851,000  
(139,573,000) 
 
Foreign currency exchange rate changes
5,449,000  
(35,082,000) 
 
Gross benefits paid
(154,676,000) 
(87,571,000) 
 
Plan amendments
2,063,000  
0  
 
Benefit obligation at end of year
2,306,859,000  
 
2,199,356,000  
 
2,352,094,000