Employee Benefit Plans (Net Periodic Benefit Cost (Benefit)) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Expected return on plan assets, net of expenses	$ (11,932)	$ (12,514)	$ (11,087)
Interest cost on projected benefit obligation	8,210	8,002	7,341
Net amortization and deferral	6,995	2,687	6,558
Net periodic expense (benefit)	$ 3,273	$ (1,825)	$ 2,812