Employee Benefit Plans (Defined Benefit Pension Plans not Recognized as Component of Combined Net Period Benefit Cost) (Detail) - Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ (57,964)	$ (60,123)
Deferred tax benefit	12,210	12,626
Amounts included in accumulated other comprehensive loss, net of tax	$ (45,934)	$ (47,497)