Pension and Postretirement Benefits - Summary of Changes in Fair Value of Pension Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Balance at January 1	$ 1,022	$ 1,067
Realized and unrealized loss on plan assets, net	(387)	(45)
Balance at December 31	$ 635	$ 1,022