Pension Benefit and Retirement Health and Life Insurance Benefits (Additional Information) (Detail) (USD $)	3 Months Ended	12 Months Ended																				3 Months Ended					12 Months Ended
	Sep. 30, 2012	Dec. 31, 2013 plan	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Voluntary Contributions [Member]	Dec. 31, 2012 Voluntary Contributions [Member]	Dec. 31, 2013 Minimum [Member]	Dec. 31, 2013 Maximum [Member]	Dec. 31, 2013 Average [Member]	Dec. 31, 2013 Historical Performance of Plan Assets Over a 17 Year Period [Member]	Dec. 31, 2013 Hypothetical rates of return on plan assets for a 10 year period [Member]	Dec. 31, 2013 Hypothetical rates of return on plan assets for a 20 year period [Member]	Dec. 31, 2013 Equity Securities [Member]	Dec. 31, 2013 Debt Securities [Member]	Dec. 31, 2013 Retirees of 65 Years Old or Yonger [Member]	Dec. 31, 2012 Retirees of 65 Years Old or Yonger [Member]	Dec. 31, 2013 Retirees of 65 Years Old or Older [Member]	Dec. 31, 2012 Retirees of 65 Years Old or Older [Member]	Dec. 31, 2013 Retirement Health and Life Insurance Benefits [Member]	Dec. 31, 2012 Retirement Health and Life Insurance Benefits [Member]	Dec. 31, 2011 Retirement Health and Life Insurance Benefits [Member]	Mar. 31, 2012 Retirement Health and Life Insurance Benefits [Member] Facility Closing [Member] High Performance Foams [Member]	Jun. 30, 2013 Pension Benefits [Member]	Dec. 31, 2012 Pension Benefits [Member]	Sep. 30, 2012 Pension Benefits [Member]	Sep. 30, 2011 Pension Benefits [Member]	Dec. 31, 2013 Pension Benefits [Member]	Dec. 31, 2012 Pension Benefits [Member]	Dec. 31, 2011 Pension Benefits [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Number of defined benefit pension plans		2
Projected benefit obligation of plan with accumulated benefit obligation in excess of plan assets		$ 144,300,000	$ 209,800,000
Accumulated benefit obligation of plan with accumulated benefit obligation in excess of plan assets		144,300,000	186,100,000
Fair value of the plan assets of plan with accumulated benefit obligation in excess of plan assets		138,200,000	143,500,000
Projected benefit obligation of plan with plan assets in excess of accumulated benefit obligation		30,000,000
Accumulated benefit obligation of plan with plan assets in excess of accumulated benefit obligation		30,000,000
Fair value of the plan assets of plan with plan assets in excess of accumulated benefit obligation		33,000,000
Curtailment charges																			0	0	0		(1,500,000)				(1,537,000)	0	0
Expenses and charges related to the termination of the operations																						1,600,000
Defined benefit plan, one-time cash payment	6,300,000																		751,000	795,000							7,276,000	6,800,000
Net loss to be recognized over next twelve months																			100,000								700,000
Settlement charge																			0	0					2,100,000		0	6,723,000
Change in discount rate		(0.75%)
Discount rate		4.75%	4.00%																2.50%	3.50%							4.00%	4.50%
Health care cost trend rate assumed for next fiscal year															7.00%	8.00%	6.50%	7.50%
Ultimate health care cost trend rate															5.00%		5.50%
Health care cost, employees age		65 years
Plan asset allocations													60.00%	40.00%
Target plan asset allocations													57.00%	43.00%
Actual return on total plan assets										9.10%
Number Of Years										18 years	10 years	20 years
Expected return on plan assets							5.00%	8.00%	7.00%		7.70%	7.60%
Defined benefit pension plans, voluntary contributions		2,100,000	1,700,000	1,700,000	13,000,000	16,000,000													751,000	795,000				0		0	13,000,000	22,723,000
Expected long-term rate of return on plan assets																			0.00%	0.00%				7.50%			7.50%	7.50%
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year					$ 13,000,000