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Note Employee benefits (Change in accumulated other comprehensive income loss) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Pension Plans    
Defined Benefit Plan Disclosure    
Accumulated other comprehensive loss at beginning of year $ 290,327 $ 311,166
Recognized During Year:    
Prior service (cost) credit 0 0
Actuarial losses (20,260) (21,859)
Ocurring during the year:    
Net acturial (gains) losses 34,263 1,020
Total (decrease) increase in AOCL 14,003 (20,839)
Accumulated other comprehensive loss at end of year 304,330 290,327
OPEB Plan    
Defined Benefit Plan Disclosure    
Accumulated other comprehensive loss at beginning of year 24,079 13,865
Recognized During Year:    
Prior service (cost) credit 3,470 3,800
Actuarial losses (1,282) (569)
Ocurring during the year:    
Net acturial (gains) losses (20,547) 6,983
Total (decrease) increase in AOCL (18,359) 10,214
Accumulated other comprehensive loss at end of year $ 5,720 $ 24,079