Multiemployer Pension Plans (Details)	12 Months Ended								12 Months Ended							12 Months Ended					12 Months Ended									24 Months Ended	12 Months Ended						4 Months Ended	8 Months Ended	12 Months Ended								2 Months Ended	10 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 Green	Dec. 31, 2012 Yellow	Dec. 31, 2012 Red	Dec. 31, 2012 Multiemployer Pension Plans Minimum USD ($)	Dec. 31, 2012 Multiemployer Pension Plans Maximum USD ($)	Dec. 31, 2012 USW Plan USD ($) agreements		Dec. 31, 2011 USW Plan USD ($)		Dec. 31, 2010 USW Plan USD ($)		Dec. 31, 2012 USW Plan Newark, Ohio and Spokane, Washington Facilities	Dec. 31, 2012 USW Plan Newark, Ohio and Spokane, Washington Facilities Starting July 2010 Until July 2015 USD ($)	Dec. 31, 2012 USW Plan Newark, Ohio and Spokane, Washington Facilities Starting July 2015 USD ($)	Dec. 31, 2012 USW Plan Bellwood, Virginia Facility USD ($)	Dec. 31, 2012 USW Plan Florence, Alabama Facility USD ($)	Dec. 31, 2012 USW Plan London, Ontario Facility	Dec. 31, 2012 IAM Plan USD ($) agreements		Dec. 31, 2011 IAM Plan USD ($)		Dec. 31, 2010 IAM Plan USD ($)		Dec. 31, 2012 IAM Plan Bellwood, Virginia Facility USD ($)	Dec. 31, 2012 IAM Plan Bellwood, Virginia Facility Starting 2013 USD ($)	Dec. 31, 2012 IAM Plan Sherman, Texas Facility USD ($)	Dec. 31, 2011 IAM Plan Sherman, Texas Facility USD ($)	Dec. 31, 2012 Teamsters Plan USD ($)		Dec. 31, 2011 Teamsters Plan USD ($)		Dec. 31, 2010 Teamsters Plan USD ($)		Apr. 30, 2012 Teamsters Plan Los Angeles, California Facility USD ($)	Dec. 31, 2012 Teamsters Plan Los Angeles, California Facility USD ($)	Dec. 31, 2012 Teamsters Plan Los Angeles, California Facility Starting 2013 USD ($)	Dec. 31, 2012 Teamsters Plan Los Angeles, California Facility Starting 2014 USD ($)	Dec. 31, 2012 Canada Wide Industrial Pension Plan USD ($)		Dec. 31, 2011 Canada Wide Industrial Pension Plan USD ($)		Dec. 31, 2010 Canada Wide Industrial Pension Plan USD ($)		Feb. 29, 2012 Canada Wide Industrial Pension Plan London, Ontario Facility CAD	Dec. 31, 2012 Canada Wide Industrial Pension Plan London, Ontario Facility CAD	Dec. 31, 2011 Canada Wide Industrial Pension Plan London, Ontario Facility	Dec. 31, 2012 No contributions required USW Plan Chandler, Arizona (Tube) and Kalamazoo, Michigan Facilities agreements
Multiemployer Pension Plan Disclosure [Line Items]
Percentage of employees participating in multiemployer pension plans to total employees	55.00%
Estimated annual contribution to pension and other postretirement benefit plans							$ 2,000,000	$ 4,000,000
EIN/Pension Plan Number									236648508	[1]											516031295	[1]									916145047	[1]									000920120	[1]
Pension Protection Act Zone Status											Green	[2]	Green	[2]							Green	[2]	Green	[2]									Green	[2]	Green	[2]							NA	[2]	NA	[2]
FIP/RP Status Pending/Implemented in 2012											No	[3]											No	[3]									No	[3]									NA	[3]
Contributions of the Company	3,900,000	3,600,000	3,300,000						3,000,000	[4]	2,600,000	[4]	2,400,000	[4]							300,000	[5]	300,000	[5]	300,000	[5]					200,000	[6]	300,000	[6]	200,000	[6]					400,000	[7]	400,000	[7]	400,000	[7]
Surcharge Imposed in 2012									No												No										No										NA
Expiration Date of Collective-Bargaining Agreement, First									Mar. 31, 2014												Dec. 31, 2013
Expiration Date of Collective-Bargaining Agreement, Last									Feb. 29, 2016												Nov. 30, 2017
Expiration Date of Collective-Bargaining Agreement																															Apr. 30, 2015										Feb. 28, 2015
Funded status of multiemployers pension plan				At least 80 percent	Between 65 and less than 80 percent	Less than 65 percent
Number of collective-bargaining agreements									3												2																													2
Percentage of employees covered by bargaining agreement															76.00%			5.00%	5.00%	13.00%							14.00%		86.00%
Monthly contributions per hour worked by each bargaining unit employee																$ 1.25	$ 1.50	$ 1.00	$ 1.25								$ 1.00	$ 1.25	$ 1.05	$ 1.00							$ 1.00	$ 1.05	$ 1.15	$ 1.25							1.15	1.20
Multiemployer Plans Funded Percentage																																																85.00%	80.00%
Company's contributions to the multiemployer plans is less than		5.00%	5.00%

[1] The “EIN/Pension Plan Number” column provides the Employee Identification Number (EIN) and the three-digit plan number, if applicable.

[2] The most recent Pension Protection Act zone status available in 2012 and 2011 for the Steelworkers Pension Trust and Western Conference of Teamsters Pension Plan is for the plan's year-end at December 31, 2011, and December 31, 2010, respectively. The most recent Pension Protection Act zone status available in 2012 and 2011 for the National Pension Plan is for the plan's year-end at December 31, 2012 and December 31, 2011. The zone status is based on information that the Company received from the plan and is certified by the plan's actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the yellow zone are between 65 percent and less than 80 percent funded, and plans in the green zone are at least 80 percent funded. The Western Conference of Teamsters Pension Plan's zone status was calculated applying the extended amortization rule to the eligible net investment loss for 2008 on a prospective method as provided for in the applicable guidance.

[3] The “FIP/RP Status Pending/Implemented” column indicates plans for which a Financial Improvement Plan (FIP) or a Rehabilitation Plan (RP) is either pending or has been implemented under the Pension Protection Act.

[4] The Company is party to three USW collective-bargaining agreements that require contributions to the Steelworkers Pension Trust. Current union contracts covering employees at the Newark, Ohio and Spokane, Washington facilities, Florence, Alabama facility and Richmond (Bellwood), Virginia facility expire in September 2015, March 2014 and November 2014, respectively. Of the three, the union contract covering employees at the Newark, Ohio and Spokane, Washington facilities is more significant because 76% of the Company's USW-represented employees are covered by that agreement. The union contracts covering employees at the Bellwood, Virginia facility and Florence, Alabama facility cover 5% and 5% of the Company's USW-represented employees, respectively. The Company makes monthly contributions per hour worked by each bargaining unit employee to the Steelworkers Pension Trust as follows: (i) the monthly contributions per hour worked by each bargaining unit employee at the Newark, Ohio and Spokane, Washington facilities are (in whole dollars) $1.25 and will increase to (in whole dollars) $1.50 in July 2015; (ii) the monthly contributions per hour worked by each bargaining unit employee at the Florence, Alabama facility are (in whole dollars) $1.25 per hour; and (iii) the monthly contributions per hour worked by each bargaining unit employee at the Bellwood, Virginia Facility are (in whole dollars) $1.00 per hour. The Company is also party to two other collective-bargaining agreements covering employees at the Chandler, Arizona (Tube) and Kalamazoo, Michigan facilities. Current union contracts covering employees at the Chandler, Arizona (Tube) and Kalamazoo, Michigan facilities expire in March 2015 and February 2016, respectively. However, these agreements do not require contributions from the Company to the Steelworkers Pension Trust because the employees at these facilities are covered under the Company's defined contribution 401(k) savings plan.

[5] The Company is party to two IAM significant collective-bargaining agreements that require contributions to the National Pension Plan. Current union contracts covering employees at the Richmond (Bellwood), Virginia, and Sherman, Texas facilities expire in November 2017 and December 2013, respectively. Of the two, the union contract covering employees at the Sherman, Texas facility is more significant because 86% of the Company's IAM-represented employees are covered by that agreement. The union contract covering employees at the Richmond (Bellwood), Virginia facility covers 14% of the Company's IAM-represented employees. The Company made monthly contributions of (in whole dollars) $1.00 per hour worked by each bargaining unit employee at the Company's Bellwood, Virginia facility to the National Pension Plan in 2012 and increased such monthly contributions to (in whole dollars) $1.25 beginning in 2013. The Company made monthly contributions of (in whole dollars) $1.00 per hour worked by each bargaining unit employee at the Company's Sherman, Texas facility to the National Pension Plan through December 2011 and increased such contributions to (in whole dollars) $1.05 per hour beginning January 2012.

[6] The Company is party to a Teamsters collective-bargaining agreement that require contributions to the Western Conference of Teamsters Pension Plan. The current contract covering employees at the Los Angeles, California facility expire in April 2015. The Company made monthly contributions of (in whole dollars) $1.00 per hour worked by each bargaining unit employee at the Los Angeles, California facility to the Western Conference of Teamsters Pension Plan through April 2012. Starting May 2012, the Company made monthly contributions of (in whole dollars) $1.05 per hour worked by each bargaining unit employee, and will increase such contributions to (in whole dollars) $1.15 starting 2013 and $1.25 starting 2014.

[7] The Company is party to a USW collective-bargaining agreement that require monthly contributions through February 2012 of (in whole Canadian dollars) C$1.15 per hour worked by each bargaining unit employee at the London, Ontario facility to CWIPP, which represents 13% of the Company's USW-represented employees. Starting March 2012, the Company made monthly contributions of (in whole Canadian dollars) C$1.20 per hour worked by each bargaining unit employee. Information relating to the Pension Protection Act zone status, FIP/RIP status and surcharge imposed are not applicable to this plan because it is a Canadian plan that does not follow the same regulations as plans that are U.S.-based. The CWIPP is a targeted benefit pension plan which provides a target amount of lifetime pension based on a pre-determined formula. The plan does not guarantee the amount of benefit. A participant's monthly benefit is calculated by multiplying the employee's service units which is based on a combination of the employee's age and service by the benefit level for the employee's group. Benefit levels are determined by the CWIPP administrator and are based on the rate of contributions and the average age and service of employees within the group. Benefit levels can vary due to changes in the collective bargaining agreement, negotiated contributions, or performance of the pension fund. Currently, the plan allows contributions from both the employer and employee, both of which are required to be negotiated with the USW. For the current term of the collective bargaining agreement expiring February 2015, no employee contributions were negotiated. At December 31, 2012 and December 31, 2011, the CWIPP's funding percentage was 85% and 80% based on the going concern valuation, respectively.