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Disclosure of accumulated other comprehensive income (loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Foreign Currency Abstract          
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Beginning Balance [1] $ (34,505) $ (31,099) $ (32,832) $ (36,099)  
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax [1] (31) 98 (1,704) (2,620)  
Reclassification adjustment for (gains) losses included in net income (loss) [1] 0 0 0 7,718  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total [1] (31) 98 (1,704) 5,098  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance [1] (34,536) (31,001) (34,536) (31,001)  
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure Abstract          
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax, Beginning Balance [1] (200,215) (102,867) (205,187) (104,302)  
Other Comprehensive Income Loss Amortization Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax [1] (579) (580) (1,738) (1,738)  
Other Comprehensive IncomeLoss Reclassification AdjustmentFrom A O C I Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax [1] 3,064 1,298 9,195 3,891  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent, Total [1] 2,485 718 7,457 2,153  
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax, Ending Balance [1] (197,730) (102,149) (197,730) (102,149)  
Unrealized Gain Loss On Investments Abstract          
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Beginning Balance [1] 15,533 4,071 8,465 (48,344)  
Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Reclassification Adjustments [1] 27,435 (19,095) 22,548 33,320  
Other Comprehensive Income Loss Reclassification Adjustment From A O C I For Writedown Of Securities Net Of Tax 0 0 11,959 0  
Other Comprehensive Income Loss Reclassification Adjustment From A O C I For Sale Of Securities Net Of Tax (109) (1,763) (113) [1] (1,763)  
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Total [1] 27,326 (20,858) 34,394 31,557  
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Ending Balance [1] 42,859 (16,787) 42,859 (16,787)  
Unrealized net gain (losses) on Cash Flow Hedges          
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Beginning Balance [1] 156 (396) (318) 0  
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period [1] (1,571) (417) (2,505) (3,024)  
Other Comprehensive Income Loss Reclassification Adjustment From A O C I On Derivatives Net Of Tax [1] 1,016 683 2,424 2,894  
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent, Total [1] (555) 266 (81) (130)  
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance [1] (399) (130) (399) (130)  
Accumulated other comprehensive income (loss) $ (189,806) $ (150,067) [1] $ (189,806) $ (150,067) [1] $ (229,872)
[1] All amounts presented are net of tax.