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Network
1114 - Disclosure - Pension and Postretirement Benefits - Components of Net Periodic Benefit Cost for Defined Benefit Pension Plans (Detail)
(http://www.anico.com/taxonomy/role/DisclosurePensionAndPostretirementBenefitsComponentsOfNetPeriodicBenefitCostForDefinedBenefitPensionPlans)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000904163 (http://www.sec.gov/CIK)
Compensation and Retirement Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Compensation and Retirement Disclosure [Abstract]
 
 
 
Service cost
59,000  
97,000  
111,000  
Interest cost
20,690,000  
18,721,000  
20,612,000  
Expected return on plan assets
(22,013,000) 
(20,856,000) 
(20,402,000) 
Amortization of net actuarial loss
12,680,000  
9,797,000  
4,421,000  
Net periodic benefit cost
11,416,000  
 
7,759,000  
 
4,742,000