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Note Employee benefits (Funded Status of the Plan) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of year	$ 685,823	$ 767,539
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at end of year	(754,558)	(816,988)	$ (778,658)
Fair value of plan assets at end of year	685,823	767,539	697,129
Funded status at year end	(68,735)	(49,449)	(81,529)
OPEB Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at end of year	(153,415)	(170,720)	(162,365)
Fair value of plan assets at end of year	0	0	0
Funded status at year end	$ (153,415)	$ (170,720)	$ (162,365)

X

- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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