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Note Other comprehensive income (loss) (Disclosure of accumulated other comprehensive income (loss)) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Foreign Currency Translation          
Beginning Balance [1] $ (46,397) $ (41,405) $ (43,034) $ (39,956)  
Other comprehensive loss before reclassifications [1] (605) (390) (3,968) (1,839)  
Net change [1] (605) (390) (3,968) (1,839)  
Ending Balance [1] (47,002) (41,795) (47,002) (41,795)  
Adjustment of pension and postretirement benefit plans          
Beginning Balance [1] (199,895) (205,928) (205,408) (211,610)  
Amounts reclassified from accumulated other comprehensive income (loss) for amortization of net losses [1] 3,285 3,421 9,856 10,263  
Amounts reclassified from accumulated other comprehensive income (loss) for amortization of prior service credit [1] (529) (580) (1,587) (1,740)  
Net change [1] 2,756 2,841 8,269 8,523  
Ending Balance [1] (197,139) (203,087) (197,139) (203,087)  
Unrealized net holding losses on debt securities          
Beginning Balance [1] (250,422) (56,414) (102,775) (69,003)  
Other comprehensive (loss) income before reclassifications [1] (39,845) 9,302 (187,492) 15,151  
Other-than-temporary impairment amounts reclassified from accumulated other comprehensive (loss) income [1] 0 0 0 6,740  
Amounts reclassified from accumulated other comprehensive (loss) income for gains on securities 0 (66) 0 (66)  
Net change [1] (39,845) 9,236 (187,492) 21,825  
Ending Balance [1] (290,267) (47,178) (290,267) (47,178)  
Unrealized holding gains on equity securities          
Beginning Balance 0 672 605 685  
Reclassification to retained earnings due to cumulative effect of accounting change [1] 0 0 (605) 0  
Other comprehensive income before reclassifications [1] 0 48 0 180  
Amounts reclassified from accumulated other comprehensive (loss) income for gains on securities [1] 0 (16) 0 (161)  
Net change [1] 0 32 (605) 19  
Ending Balance 0 704 0 704  
Unrealized net (losses) gain on cash flow hedges          
Beginning Balance [1] (78) 132 (40) (402)  
Other comprehensive (loss) income before reclassifications [1] 208 (250) 790 (869)  
Amounts reclassified from other accumulated other comprehensive (loss) income [1] 89 142 (531) 1,295  
Net change [1] 297 (108) 259 426  
Ending Balance [1] 219 24 219 24  
Accumulated other comprehensive (loss) income [1] $ (534,189) $ (291,332) $ (534,189) $ (291,332) $ (350,652)
[1]
All amounts presented are net of tax.