Debt - Additional Information (Detail) (USD $)	12 Months Ended					12 Months Ended			1 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 11, 2012	Feb. 17, 2010	Dec. 31, 2013 Senior Notes [Member]	Dec. 31, 2012 Senior Notes [Member]	Dec. 31, 2011 Senior Notes [Member]	May 31, 2011 Term Loan Facility [Member]	Oct. 31, 2010 Term Loan Facility [Member]	Dec. 31, 2012 Term Loan Facility [Member]	Dec. 31, 2013 11% senior unsecured notes [Member]	Dec. 31, 2012 11% senior unsecured notes [Member]	Oct. 11, 2012 11% senior unsecured notes [Member]	Dec. 31, 2013 8.25% Senior Convertible Notes [Member]	Dec. 31, 2012 8.25% Senior Convertible Notes [Member]	Feb. 17, 2010 8.25% Senior Convertible Notes [Member]
Debt Instrument [Line Items]
Interest payment due dates	January 1, April 1, July 1 and October 1, beginning January 1, 2013														March 1 and September 1 of each year, beginning September 1, 2010
Debt instrument interest rate stated percentage				11.00%		11.00%						11.00%	11.00%			8.25%
Offering cost of senior notes												$ 79,750,000	$ 79,750,000	$ 79,800,000			$ 32,000,000
Sale of 11 percent senior unsecured notes due												Oct. 11, 2014
Percent of principal amount												96.00%
Warrants to purchase share of our common stock												800,000
Exercise price of common stock												10.00
Financing costs associated with the senior convertible notes	0	3,111,000	1,000,000									1,300,000	3,200,000
Sale of equity interest in Harvest Holding												29.00%
Cost of Sale of Equity interest												125,000,000
Notes redeemed						80,000,000						80,000,000
Loss on early extinguishment of debt	0	(5,425,000)	(13,132,000)						13,100,000			3,600,000
Write off of discount on debt									10,600,000			2,300,000
Placement fees and other transaction costs									400,000			1,300,000
Sale of assets	5,000,000
Unsecured senior notes repurchase offer period in case of specified sales proceeds of assets	30 days
Percent of the principal amount plus accrued and unpaid interest	105.50%
Percent in the case of a change in control	101.00%
Percent in the case of a sale of Petrodelta plus accrued interest	105.50%
Embedded derivative value	0
Convertible Debt equity instruments issued		4,600,000.0000	100,000.0000		175.2234
Principal amount of senior convertible notes			1,000
Debt instrument, convertible, conversion price			$ 5.71
Senior convertible notes, exchanged							25,500,000	500,000
Term loan facility prepaid	0	0	60,000,000						60,000,000	60,000,000	6,000,000
New debt received in exchange of old debt													10,500,000
Convertible debt equity instruments conversion price		$ 5.59
Deferred financing cost		600,000
Initial interest rate										10.00%
Interim interest rate										15.00%
Percentage of prepayment premium									3.50%
Debt outstanding amount on which prepayment premium paid									$ 2,100,000