Pension and Postretirement Benefits - Schedule of Accumulated Other Comprehensive Income Expected to be Recognized as Components of Net Periodic Benefit Cost (Detail) (Other Postretirement Benefit Obligations [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Other Postretirement Benefit Obligations [Member]
Schedule Of Other Postretirement Benefits [Line Items]
Transition obligation (asset)
Net loss	651
Prior service cost (credit)
Total amounts expected to be recognized during 2014	$ 651