Derivative and Other Financial Instruments and Fair Value Measurements - Additional Information (Detail) $ / shares in Units, t in Millions, BTU in Trillions		3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 11, 2010 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) BTU t $ / shares shares	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) $ / shares	Sep. 30, 2016 EUR (€) shares
Derivative [Line Items]
Derivative contracts | t				25.6
Cash collateral posted or held		$ 0		$ 0
Amount subject to enforceable master netting arrangement not offset		$ 0		$ 0		$ 0
Warrant issued to purchase common stock | shares	1,500,000
Aggregate purchase price of common stock warrant	$ 300,000
Exercise price of warrants | $ / shares	$ 10.30	$ 5.64		$ 5.64
Common stock warrants percentage vested	100.00%
Common stock warrants expiration date				2020-06
Warrants exercised on cashless basis | shares				20,000
Warrants outstanding | shares		1,448,333		1,448,333			1,448,333
Redeemable Preferred Stock
Derivative [Line Items]
Preferred stock redemption period				47 months
Credit spread adjustment percentage				15.50%
Maximum
Derivative [Line Items]
Number of days financing receivable is estimated to be outstanding				30 days
Factoring Facility
Derivative [Line Items]
Maximum financing amount | €							€ 50,000,000
Sales of trade accounts receivable		$ 96,700,000	$ 117,600,000	$ 270,200,000	$ 336,900,000
Proceeds from sales of trade accounts receivable		92,700,000	120,800,000	262,700,000	289,500,000
Administrative fees and expenses associated with Factoring Facility		$ 200,000	$ 200,000	$ 600,000	$ 600,000
Common Stock Warrant Liability
Derivative [Line Items]
Valuation technique				Monte Carlo simulation
Volatility				47.40%		49.90%
Expected term				3 years 8 months 12 days		4 years 4 months 24 days
Equity raise probability				60.00%
Equity raise price discount assumption				15.00%
Common stock price on measurement date | $ / shares		$ 6.12		$ 6.12		$ 8.03
Percentage of increase decrease in unobservable inputs on estimated fair value of common stock warrant liability				10.00%
NABCO
Derivative [Line Items]
Price per share of common stock issued | $ / shares		$ 5.64		$ 5.64
Currency Exchange Hedging
Derivative [Line Items]
Currency derivative contracts outstanding		$ 0		$ 0
Natural Gas | Swap Contract One
Derivative [Line Items]
Forward buy contracts | BTU				1.6