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Accumulated Other Comprehensive Income (Loss) (AOCI) (Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 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 77,806    
Change in foreign currency translation adjustment 7,166    
Amortization of net actuarial loss 915    
Amortization of prior service credit (1,018)    
Tax effect (18,552) $ 14,078  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (94,256)    
Allocated to the Company (94,257)   $ (160,575)
Allocated to noncontrolling interests 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 77,806    
Tax effect (18,301) 14,118  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance 17,340    
Allocated to the Company 17,339    
Allocated to noncontrolling interests 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 7,166    
Tax effect (278) 0  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (58,740)    
Allocated to the Company (58,740)    
Allocated to noncontrolling interests 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 915    
Amortization of prior service credit (1,018)    
Tax effect 27 $ (40)  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (52,856)    
Allocated to the Company (52,856)    
Allocated to noncontrolling interests $ 0