Employee Benefit Plans (Defined Benefit Pension Plans Recognized as Component of Other Comprehensive Income) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	$ 1,979	$ (2,223)	$ 4,832
Deferred tax (expense) benefit	(416)	466	(1,774)
Other comprehensive income (loss), net of tax	$ 1,563	$ (1,757)	$ 3,058