Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended				12 Months Ended			1 Months Ended			12 Months Ended							12 Months Ended								12 Months Ended					12 Months Ended		1 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended				12 Months Ended				1 Months Ended
	Dec. 31, 2012 Y	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Stock Appreciation Rights (SARs) [Member]	Dec. 31, 2012 Stock Appreciation Rights (SARs) [Member] General and Administrative Expense [Member]	Dec. 31, 2012 Stock Appreciation Rights (SARs) [Member] Restructuring Charges [Member]	Sep. 30, 2012 2005 Contingent Stock Plan [Member]	Feb. 29, 2012 2005 Contingent Stock Plan [Member]	Feb. 28, 2011 2005 Contingent Stock Plan [Member]	Dec. 31, 2012 2005 Contingent Stock Plan [Member]	Dec. 31, 2011 2005 Contingent Stock Plan [Member]	Dec. 31, 2010 2005 Contingent Stock Plan [Member]	Dec. 31, 2011 2002 Directors Stock Plan [Member]	Dec. 31, 2012 2002 Directors Stock Plan [Member]	May 31, 2011 2002 Directors Stock Plan [Member]	Dec. 31, 2010 2002 Directors Stock Plan [Member]	Dec. 31, 2012 2002 Directors Stock Plan amended [Member]	Dec. 31, 2012 Maximum [Member] 2005 Contingent Stock Plan [Member]	Dec. 31, 2011 Maximum [Member] 2005 Contingent Stock Plan [Member]	Dec. 31, 2012 Psu Awards [Member]	Dec. 31, 2012 2012 Three-year PSU Awards [Member]	Sep. 30, 2012 2012 Three-year PSU Awards [Member]	Sep. 01, 2012 2012 Three-year PSU Awards [Member]	Mar. 27, 2012 2012 Three-year PSU Awards [Member]	Dec. 31, 2012 2012 Three-year PSU Awards [Member] Minimum [Member]	Dec. 31, 2012 2012 Three-year PSU Awards [Member] Maximum [Member]	Dec. 31, 2012 2011 Three-year PSU Awards [Member]	Dec. 31, 2011 2011 Three-year PSU Awards [Member]	Mar. 11, 2011 2011 Three-year PSU Awards [Member]	Dec. 31, 2011 2011 Three-year PSU Awards [Member] Minimum [Member]	Dec. 31, 2011 2011 Three-year PSU Awards [Member] Maximum [Member]	Feb. 29, 2012 2009 Three-year PSU Awards [Member]	Dec. 31, 2012 2009 Three-year PSU Awards [Member]	Dec. 31, 2011 2009 Three-year PSU Awards [Member]	Dec. 31, 2010 2009 Three-year PSU Awards [Member]	Dec. 31, 2012 2009 Three-year PSU Awards [Member] 2005 Contingent Stock Plan [Member]	Feb. 28, 2011 2009 Two-year PSU Awards [Member]	Dec. 31, 2012 2009 Two-year PSU Awards [Member]	Dec. 31, 2011 2009 Two-year PSU Awards [Member]	Dec. 31, 2010 2009 Two-year PSU Awards [Member]	Dec. 31, 2011 2009 Two-year PSU Awards [Member] 2005 Contingent Stock Plan [Member]	Dec. 31, 2012 2012 CEO Incentive Compensation [Member]	Dec. 31, 2012 SLO Awards [Member]	Mar. 09, 2012 SLO Awards [Member]	Dec. 31, 2011 SLO Awards [Member]	Feb. 28, 2013 2010 Three-year PSU Awards [Member] Subsequent Event [Member]	Sep. 01, 2012 Restricted Stock [Member] 2005 Contingent Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared per common share	$ 0.13
Estimated dividend payment	$ 25,000,000
Common stock issued	204,660,621	202,528,616	169,272,636	168,749,681
Common stock outstanding	194,557,669	192,062,185
Weighted average remaining vesting life					1 year
Compensation expense						19,000,000	9,000,000
Payment due to exercise SARs						24,000,000	19,000,000
Liability for SARs						41,000,000	1,000,000
Liabilities related to cash awards	800,000
Weighted - average remaining contractual life of non vested restricted stock shares	1.7
Weighted - average remaining contractual life of non vested restricted stock units	1.7
Weighted - average remaining contractual life of non vested cash awards	2.0
Number of shares of common stock reserved for issuance																400,000
Increase number of shares of common stock reserved for issuance under the plan														200,000				200,000
Excess of fair value over share issue price	1,000,000	700,000	500,000
Period in the beginning of each year to award Performance Share Unit																					90 days
Dividends accrued in other current liabilities																					1,200,000
Recordable incident rate to be achieved under additional goal																						0.90 or better							1.20 or better
Average return on invested capital																						50.00%
Growth of net trade sales																						25.00%
Weighted average return on total share holders																						25.00%
Targeted number of common stock shares to be earned under the performance incentive plan								350,000														546,689							378,477
Shares to be issued as a percentage of target shares under the performance incentive plan																			200.00%	200.00%						0.00%	200.00%				0.00%	200.00%															116.50%
Aggregate increase or decrease in the number of shares earned for all participants based on the performance																						54,669							37,848
Shares granted																							140,155	140,155	406,534
Per share price of common stock											$ 17.19	$ 24.93	$ 21.46	$ 25.77	$ 16.26		$ 21.72							$ 14.27	$ 19.72					$ 26.18
Target level for the determination of performance goals and measures																						100.00%				0.00%	67.00%	84.00%
Valuation per share																								$ 12.57	$ 23.40
Targeted number of common stock shares to be earned under the performance incentive plan at ROIC target level																						136,672				0	183,141	158,960
Increase or decrease in the number of shares earned for each participant based on the performance																													Up to 10% of the target
Targeted number of common stock shares to be earned under performance incentive plan at volume target level																												109,758
Percentage targeted number of common stock shares net of forfeiture related to volume goal																												58.00%
Shares of common stock issued for the 2009 two-year PSU awards											703,620	308,650	403,360																				1,155,018	1,155,018				1,114,139		1,114,139							472,865
Acquired stock under 2005 contingent stock plan									414,210	408,751																																					172,204
Shares Withheld for Minimum Tax Obligation in Treasury Stock at Fair Value																																					9,000,000					12,000,000
Reduction of base salary																																											$ 100,000
Percentage weight of EBITDA for primary metrics of performance share units																																											70.00%
Percentage weight of net debt for primary metrics of performance share units																																											30.00%
Targeted number of common stock shares to be earned under the performance incentive plan for adjusted EBITDA goal																																											0
Target level for the determination of performance goals and measures for adjusted EBITDA goal																																											0.00%
Target level for determination of net debt reduction goals measures																																											0.00%
Targeted number of common stock shares to be earned for net debt reduction goals																																											0
Restricted shares issued								50,000
Shares expected to be issued																																																25,000
Share based compensation stock award premium	25.00%																																											25.00%		25.00%
Restricted stock shares and restricted stock units included in SLO Award target																																												73,698	11,212