Financing Arrangements (Details) - USD ($)	Oct. 24, 2014	Jul. 31, 2014	Dec. 31, 2015	Oct. 21, 2015	Aug. 13, 2015	Dec. 31, 2014	Oct. 23, 2014	Apr. 07, 2011
Line of Credit Facility [Line Items]
Capital lease agreement			$ 17,700,000		$ 50,000,000
Long-term debt			468,100,000			$ 443,800,000
Foreign subsidiaries borrowings			800,000			0
Foreign subsidiaries bank guarantee amount			$ 3,900,000			$ 5,200,000
Weighted average interest rate			5.47%			5.62%
Revolving credit facility
Line of Credit Facility [Line Items]
Long-term debt			$ 169,000,000			$ 162,000,000
Senior notes, interest rate			2.09%
Term Loan
Line of Credit Facility [Line Items]
Long-term debt			$ 27,900,000			28,800,000
Senior notes, interest rate			2.38%
Standby letters of credit
Line of Credit Facility [Line Items]
Amount outstanding			$ 21,400,000
8.125% senior notes due 2021
Line of Credit Facility [Line Items]
Long-term debt			$ 250,000,000			$ 250,000,000
Aggregate principal amount of debt								$ 250,000,000.0
Senior notes, interest rate			8.125%					8.125%
Credit Agreement | Revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 230,000,000.0
Inventory advance rate		50.00%
Term loan, period		7 years
Option to increase availability		$ 25,000,000.0
Credit Agreement | Revolving credit facility, Canadian sub-limit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		15,000,000.0
Credit Agreement | Revolving credit facility, European sub-limit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		10,000,000.0
Maximum borrowing capacity, potential		25,000,000.0
Credit Agreement | Term Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 16,100,000.0
Credit Agreement | LIBOR | Revolving credit facility | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		1.50%
Credit Agreement | LIBOR | Revolving credit facility | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		2.50%
Credit Agreement | LIBOR | Term Loan | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		2.00%
Credit Agreement | LIBOR | Term Loan | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		3.00%
Credit Agreement | Prime lending rate | Revolving credit facility | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		0.25%
Credit Agreement | Prime lending rate | Revolving credit facility | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		1.25%
Credit Agreement | Prime lending rate | Term Loan | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		0.75%
Credit Agreement | Prime lending rate | Term Loan | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		0.25%
Credit Agreement | Canadian deposit offered rate | Revolving credit facility, Canadian sub-limit | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		1.50%
Credit Agreement | Canadian deposit offered rate | Revolving credit facility, Canadian sub-limit | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		2.50%
Credit Agreement | Canadian prime lending rate | Revolving credit facility, Canadian sub-limit | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		0.00%
Credit Agreement | Canadian prime lending rate | Revolving credit facility, Canadian sub-limit | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		1.00%
Credit Agreement | US base rate | Revolving credit facility, Canadian sub-limit | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		0.00%
Credit Agreement | US base rate | Revolving credit facility, Canadian sub-limit | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable interest rate		1.00%
Amended Credit Agreement | Revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 275,000,000.0
Inventory advance rate	60.00%
Inventory advance rate reducing back to	50.00%
Term over which inventory advance rate reduces	36 months
Amount outstanding	$ 22,000,000
Term over which basis spread on variable rate reduces	36 months
Unused borrowing capacity			$ 69,300,000
Amended Credit Agreement | Revolving credit facility, Canadian sub-limit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 25,000,000.0
Amended Credit Agreement | Revolving credit facility, European sub-limit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	25,000,000.0
Amended Credit Agreement | Term Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 35,000,000.0
Amount outstanding							$ 15,500,000
Amended Credit Agreement | LIBOR | Revolving credit facility
Line of Credit Facility [Line Items]
Basis spread on variable interest rate	3.50%
Arkansas Development Finance Authority | Southwest Steel Processing LLC
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 11,000,000.0
Amount outstanding			$ 0