Retirement Plans - Net Periodic Pension Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Net settlement loss	$ 1,878	$ 1,960
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	3,376	3,655	4,151
Expected return on plan assets	(5,197)	(4,808)	(5,280)
Recognized net actuarial loss	839	3,611	2,404
Net settlement loss	1,878	1,960
Total net periodic pension expense	$ 896	$ 4,418	$ 1,275