Employer Sponsored Benefit Plan (Components of Net Periodic Benefit Cost) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest cost	$ 2,453	$ 2,583	$ 2,589
Expected return on plan assets	(2,691)	(2,559)	(2,644)
Amortization of actuarial net loss	1,069	918	582
Total net periodic benefit cost	$ 831	$ 942	$ 527