Long-Term Debt and Other Financing - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended			12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 18, 2011	Aug. 31, 2011 Extinguished Debt	Apr. 30, 2011 Extinguished Debt	Aug. 31, 2011 Extinguished Debt Dunkirk Specialty Steel Note	Dec. 31, 2012 Revolving Credit Facility	Dec. 31, 2012 Revolving Credit Facility Minimum	Dec. 31, 2012 Revolving Credit Facility Maximum	Dec. 31, 2012 Revolving Credit Facility Extinguished Debt	Dec. 31, 2012 Term Loan	Dec. 31, 2012 Term Loan Extinguished Debt	Aug. 18, 2011 Convertible Promissory Notes	Dec. 31, 2012 Amended Credit Agreement	Dec. 31, 2012 Amended Credit Agreement Revolving Credit Facility	Mar. 19, 2012 Amended Credit Agreement Revolving Credit Facility	Dec. 31, 2012 Amended Credit Agreement Term Loan	Mar. 19, 2012 Amended Credit Agreement Term Loan
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity																$ 105,000,000		$ 20,000,000
Credit agreement amendment date	Mar. 19, 2012
Line of credit original expiration date	2016-08
Line of credit facility extended expiration year	2017-03
Deferred Finance Costs, Net		1,400,000												348,000
Minimum incremental increase in revolver capacity								10,000,000
Maximum borrowings under revolver									130,000,000	15,000,000		12,000,000
Commitment fee on the daily unused portion of the Revolver							0.25%
Maximum swing loans available under revolving credit facility	7,000,000
Quarterly term loan payments											750,000
Variable LIBOR rate															1.96%		1.96%
Variable LIBOR rate, swing loan														2.09%
Maximum leverage ratio	3.25
Minimum leverage ratio	1.00
Maximum leverage ratio at credit facility expiration	2.75
Minimum leverage ratio at credit facility expiration	1.00
Maximum fixed charge coverage ratio	1.20
Minimum fixed charge coverage ratio	1.00
Maximum required leverage ratio under credit facility	3.00
Minimum required leverage ratio under credit facility	1.00
Convertible notes													20,000,000
Interest rate on convertible notes			4.00%
Maturity date of Convertible Notes	Aug. 17, 2017
Commencement of prepay period of convertible notes outstanding	Aug. 17, 2014
Conversion stock price for Convertible Notes	$ 47.1675
Stock price trigger for convertible note prepay option	140.00%
Line of credit, repayment date				2011-08	2011-04	2011-08						2011-08
Unamortized deferred finance costs written off												44,000
Loan amount				400,000	200,000
Loan period				20 years	15 years	10 years
Loan, interest rate				6.00%	5.00%	5.00%
Number of Notes Payable						2
Notes Payable						$ 3,000,000