Employee Benefit Plans - Reclassifications from Accumulated Other Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Amortization of actuarial loss and prior service costs-total before tax	$ 1,093	[1]
Tax benefit	(408)		(427)	(160)
Net of tax	$ 685		$ 720	$ 270

[1] The amortization expense is included in the computation of periodic pension cost and is a decrease to net income upon reclassification from accumulated other comprehensive loss.