Pension and Other Postretirement Benefits - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2008 Age
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Minimum age to attain pension benefits						50
Maximum age plus years service to attain pension benefits						65
Adjustment to the pension and postretirement liabilities	$ (5,600,000)
Pension obligations carved out and assigned to the buyer	24,400,000
Postretirement obligations carved out and assigned to the buyer	7,400,000
Pension assets carved out and assigned to the buyer	17,700,000
Decrease on gain on sale of marine business		2,400,000
Increase trend rate by 1%, increase the benefit expenses			4,600,000
Increase trend rate by 1%, increase the benefit obligation			300,000
Decrease trend rate by 1%, decrease the benefit expenses			4,000,000
Decrease trend rate by 1%, decrease the benefit obligation			200,000
Defined benefit plans, annual average Medicare part D subsidy			300,000
Defined contribution plans, costs			10,100,000	10,200,000	9,000,000
Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation percentage of securities			45.00%
Fixed Income Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation percentage of securities			35.00%
Other Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation percentage of securities			20.00%
Pension
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension obligations carved out and assigned to the buyer				28,568,000
Postretirement obligations carved out and assigned to the buyer				19,619,000
Discount rate		4.28%	4.27%	4.28%
Increase in pension and postretirement obligations			17,500,000
Other Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension obligations carved out and assigned to the buyer				10,361,000
Discount rate		3.95%	3.83%	3.95%
Increase in pension and postretirement obligations			1,400,000
Initial healthcare trend rate			8.15%	8.50%
Postretirement Health Care Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase in other postretirement obligations			900,000
Expected employer contribution for year 2011			3,200,000
U.S. And Foreign Defined Benefit Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation		393,400,000	396,700,000	393,400,000
Accumulated benefit obligations in excess of plan assets, projected benefit obligation		393,000,000	397,200,000	393,000,000
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation		392,700,000	396,700,000	392,700,000
Accumulated benefit obligations in excess of plan assets, fair value of plan assets		242,600,000	276,900,000	242,600,000
Expected employer contribution for year 2011			$ 7,100,000
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate			4.31%
United States Postretirement Benefit Plans of US Entity, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate			3.83%