Bankruptcy Disclosures - Additional Information (Detail) (USD $)	1 Months Ended				12 Months Ended					1 Months Ended			1 Months Ended				12 Months Ended		1 Months Ended	12 Months Ended					12 Months Ended
	Sep. 02, 2011	Jul. 23, 2010	May 27, 2010	Nov. 20, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2008	Dec. 31, 2010 Backstop Agreement	Jul. 23, 2010 Existing equity holders	Jul. 23, 2010 Rights Offering	Jul. 23, 2010 Rights Offering Payment in cash	Jul. 23, 2010 Rights Offering Exchange of the 2008 Senior Notes	Jul. 23, 2010 Rights Offering Emergence	Jul. 23, 2010 Rights Offering Iissued to the holders of the 2008 Senior Notes	Jul. 23, 2010 Minimum	Jun. 30, 2009 Minimum	Dec. 31, 2010 Maximum Backstop Agreement	Jul. 23, 2010 Maximum Rights Offering	Aug. 20, 2008 11% Senior Unsecured Notes Due Twenty Thirteen	Dec. 31, 2012 11% Senior Unsecured Notes Due Twenty Thirteen	Dec. 31, 2010 11% Senior Unsecured Notes Due Twenty Thirteen	Dec. 31, 2008 11% Senior Unsecured Notes Due Twenty Thirteen	Dec. 31, 2010 11% Senior Unsecured Notes Due Twenty Thirteen Before Modification	Dec. 31, 2010 11% Senior Unsecured Notes Due Twenty Thirteen After Modification	Dec. 31, 2010 11% Senior Unsecured Notes Due Twenty Thirteen Backstop Agreement	Dec. 31, 2010 11% Senior Unsecured Notes Due Twenty Thirteen Minimum Backstop Agreement	Dec. 31, 2010 12.25% Senior Secured Notes Due Twenty Fourteen
Loss Contingencies [Line Items]
Compliance description							The delay in the quarterly report on Form 10-Q caused a noncompliance with the covenant in the indenture governing the $210.0 million of 11% unsecured senior notes due 2013 (the "2008 Senior Notes").
Senior notes covenant amount																						$ 210,000,000
Percentage of principal amount																75.00%
Date of petition for bankruptcy filed with the bankruptcy court				Nov. 20, 2009
Actions taken			On May 27, 2010, the Bankruptcy Court entered an order confirming and approving the plan of reorganization (the "Final Chapter 11 Plan").
New common shares issued		33,334,060							15,125,331
Common shares to be issued																		85,000,000
Common shares to be issued upon emergence, purchase price per share										$ 5.40
Common shares, subscribed										12,585,356
Common shares, subscribed value										68,000,000	64,900,000	3,100,000
Percentage of capital stock													86.10%	13.90%
Common stock issued by exchanging 2008 senior notes, value																										20,000,000
Common stock issued by exchanging 2008 senior notes, share																			925,926						3,703,704
Commitment amount								20,000,000
Cash backstop fee								4,200,000
offering percentage								5.00%
Proceeds from public offering																	85,000,000
Senior Notes exchanged for post-emergence New Common Shares																				5,000,000
Common shares reserve to be held in escrow					993,743
Common shares release from escrow					993,743
Senior notes																							210,000,000	107,000,000
Repayment of senior notes																					74,900,000
Exchange of debt for common shares						28,071,000
Secured debt outstanding																											$ 107,000,000
Debt interest rate																											12.25%
Debt instrument maturity date																											Jul. 23, 2014
Date of Chapter 11 cases were closed	Sep. 02, 2011
Percentage of common shares outstanding upon emergence															50.00%