Pension Plans and Other Postretirement Benefits - Estimated Amounts to Be Amortized from Accumulated Other Comprehensive Income into Net Periodic Benefit Costs (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	$ (95)	$ (95)	$ (697)
Total Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(689)	(757)	(953)
Domestic Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(741)	(812)	(1,009)
Forecast for 2013 | Total Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(95)
Forecast for 2013 | Total Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	(689)
Forecast for 2013 | Domestic Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	$ (741)