Employee Benefit Plans (Net Periodic Benefit Cost (Benefit)) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Expected return on plan assets, net of expenses	$ (10,772)	$ (11,916)	$ (11,117)
Interest cost on projected benefit obligation	6,472	5,898	6,189
Net amortization and deferral	5,623	5,002	5,429
Net periodic expense (benefit)	$ 1,323	$ (1,016)	$ 501