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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, 2017
Mar. 31, 2016
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance $ (230,393)    
Change in unrealized gains (losses) on securities 39,632    
Change in foreign currency translation adjustment 3,434    
Amortization of net actuarial loss 6,933    
Amortization of prior service credit (1,211)    
Tax effect (16,370) $ (22,296)  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (197,975)    
Allocated to the Company (197,989)   $ (230,400)
Allocated to noncontrolling interests 14    
Unrealized Gains (Losses) on Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance (26,760)    
Change in unrealized gains (losses) on securities 39,632    
Tax effect (14,181) (20,066)  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (1,309)    
Allocated to the Company (1,323)    
Allocated to noncontrolling interests 14    
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 (63,576)    
Change in foreign currency translation adjustment 3,434    
Tax effect 0 0  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (60,142)    
Allocated to the Company (60,142)    
Pension Benefit Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Accumulated other comprehensive income (loss) including non-controlling interest, Beginning Balance (140,057)    
Amortization of net actuarial loss 6,933    
Amortization of prior service credit (1,211)    
Tax effect (2,189) $ (2,230)  
Accumulated other comprehensive income (loss) including non-controlling interest, Ending Balance (136,524)    
Allocated to the Company $ (136,524)