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Accumulated Other Comprehensive Income (Loss) (AOCI) (Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]          
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance     $ (160,573)    
Change in unrealized gains (losses) on debt securities     147,634    
Change in foreign currency translation adjustment     10,760    
Amortization of net actuarial loss     1,830    
Amortization of prior service credit     (2,035)    
Tax effect $ (16,777) $ 3,628 (35,329) $ 17,706  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (37,713)   (37,713)    
Allocated to the Company (37,714)   (37,714)   $ (160,575)
Allocated to noncontrolling interests 1   1    
Unrealized gains (losses) on debt securities          
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]          
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance     (42,165)    
Change in unrealized gains (losses) on debt securities     147,634    
Tax effect (16,654) 3,669 (34,955) 17,787  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance 70,514   70,514    
Allocated to the Company 70,513   70,513    
Allocated to noncontrolling interests 1   1    
Foreign Currency Translation Adjustment          
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]          
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance     (65,628)    
Change in foreign currency translation adjustment     10,760    
Tax effect (150) 0 (428) 0  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (55,296)   (55,296)    
Allocated to the Company (55,296)   (55,296)    
Allocated to noncontrolling interests 0   0    
Pension Benefit Adjustment          
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]          
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance     (52,780)    
Amortization of net actuarial loss     1,830    
Amortization of prior service credit     (2,035)    
Tax effect 27 $ (41) 54 $ (81)  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (52,931)   (52,931)    
Allocated to the Company (52,931)   (52,931)    
Allocated to noncontrolling interests $ 0   $ 0