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1102 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Detail)
(http://www.anico.com/taxonomy/role/DisclosureAccumulatedOtherComprehensiveIncomeLossComponentsOfOtherComprehensiveIncomeLoss)
TableAccumulated Other Comprehensive Income (Loss) [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000904163 (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]
Net Unrealized Gains (Losses) on Securities [Member]Defined Benefit Pension Plan Adjustments [Member]Foreign Currency Adjustments [Member]Equity Component [Domain]Net Unrealized Gains (Losses) on Securities [Member]Defined Benefit Pension Plan Adjustments [Member]Foreign Currency Adjustments [Member]Equity Component [Domain]Net Unrealized Gains (Losses) on Securities [Member]Defined Benefit Pension Plan Adjustments [Member]Foreign Currency Adjustments [Member]Equity Component [Domain]
Accumulated Other Comprehensive Income, Beginning balance
453,434,000  
(97,889,000) 
(2,925,000) 
352,620,000  
568,151,000  
(76,074,000) 
(1,295,000) 
490,782,000  
457,937,000  
(43,884,000) 
(341,000) 
413,712,000  
Amounts reclassified from AOCI, net of tax expense (benefit)
(14,308,000) 
8,242,000  
 
(6,066,000) 
(23,856,000) 
6,368,000  
 
(17,488,000) 
(22,990,000) 
2,873,000  
 
(20,117,000) 
Unrealized holding gains (losses) arising during the period, net of tax expense (benefit)
133,451,000  
  
133,451,000  
(135,035,000) 
  
(135,035,000) 
147,709,000  
  
147,709,000  
Unrealized adjustment to DAC, net of tax expense (benefit)
(18,756,000) 
  
(18,756,000) 
38,554,000  
  
38,554,000  
(8,625,000) 
  
(8,625,000) 
Unrealized gains (losses) on investments attributable to participating policyholders' interest, net of tax expense (benefit)
(6,683,000) 
  
(6,683,000) 
5,620,000  
  
5,620,000  
(5,880,000) 
  
(5,880,000) 
Actuarial gain (loss) arising during the period net of tax expense (benefit)
 
1,044,000  
 
1,044,000  
 
(28,183,000) 
 
(28,183,000) 
 
(35,063,000) 
 
(35,063,000) 
Foreign currency adjustment, net of tax expense (benefit)
  
289,000  
289,000  
  
(1,630,000) 
(1,630,000) 
  
(954,000) 
(954,000) 
Accumulated Other Comprehensive Income, Ending balance
547,138,000  
 
(88,603,000) 
 
(2,636,000) 
 
455,899,000  
 
453,434,000  
 
(97,889,000) 
 
(2,925,000) 
 
352,620,000  
 
568,151,000  
 
(76,074,000) 
 
(1,295,000) 
 
490,782,000