Business and Operations - Additional Information (Detail)		1 Months Ended								9 Months Ended
	Jan. 08, 2015	Jul. 31, 2015 USD ($) shares	Jun. 30, 2015 USD ($) shares	Apr. 30, 2015 USD ($) shares	Feb. 28, 2015 USD ($) $ / shares shares	Feb. 28, 2015 EUR (€) shares	Jan. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) $ / shares shares	Oct. 31, 2014 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) Employee Facility shares
Organization And Business Activities [Line Items]
Facilities | Facility										24
Employees | Employee										1,700
Proceeds from issuance of common stock, net of issuance costs										$ 63,300,000
Initial draw amount used to operating purposes					$ 14,000,000
Common stock issued | shares										11,304,673
Controlled Equity Offering Program
Organization And Business Activities [Line Items]
Proceeds from issuance of common stock, net of issuance costs		$ 5,500,000	$ 2,700,000
Common stock issued | shares		500,000	200,000
Rights Offering
Organization And Business Activities [Line Items]
Number of shares issued | shares				800,000	9,800,000	9,800,000
Proceeds from Rights Offering				$ 4,800,000	$ 55,000,000
Real Alloy Acquisition
Organization And Business Activities [Line Items]
Initial draw amount used to fund acquisition					$ 73,500,000
Real Alloy Acquisition | Redeemable Preferred Stock
Organization And Business Activities [Line Items]
Number of shares issued | shares					25,000	25,000
Preferred stock, liquidation preference per share | $ / shares					$ 1,000
Real Alloy Acquisition | Rights Offering
Organization And Business Activities [Line Items]
Proceeds from issuance of common stock used to fund acquisition					$ 50,000,000
Senior Secured Notes
Organization And Business Activities [Line Items]
Senior secured notes principal amount							$ 305,000,000
Debt instrument discount percentage	97.206%						97.206%
Proceeds from issuance of debt							$ 296,500,000
Debt, due date							Jan. 15, 2019			Jan. 15, 2019
Asset Based Facility
Organization And Business Activities [Line Items]
Debt, due date										Oct. 15, 2018
Initial Draw Amount					59,500,000
Maximum financing amount of factoring facility					110,000,000
Factoring Facility
Organization And Business Activities [Line Items]
Initial Draw Amount					$ 28,000,000	€ 25,000,000
Maximum financing amount of factoring facility | €						€ 50,000,000
October Private Placement
Organization And Business Activities [Line Items]
Number of shares issued | shares									300,000
Sale of stock, price per share | $ / shares									$ 10.00
Proceeds from issuance of common stock, net of issuance costs									$ 3,000,000
Equity Offering
Organization And Business Activities [Line Items]
Number of shares issued | shares								4,400,000
Sale of stock, price per share | $ / shares								$ 6.50
Proceeds from issuance of common stock, net of issuance costs								$ 28,500,000