Note 6. Credit Facilities and Capital Leases (Detail) (USD $)	1 Months Ended			3 Months Ended	7 Months Ended	12 Months Ended						1 Months Ended	12 Months Ended	1 Months Ended			12 Months Ended			1 Months Ended						0 Months Ended	1 Months Ended				1 Months Ended
	Oct. 31, 2009	Jun. 30, 2009	Feb. 28, 2009	Dec. 31, 2008	Dec. 31, 2009	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2011	Dec. 31, 2011 Term Facility [Member]	Dec. 31, 2011 General Corporate [Member]	Feb. 28, 2009 Exerice Of Over-Allotment Option [Member]	Dec. 31, 2011 Leverage Ratio [Member]	Oct. 31, 2009 Convertible Preferred Stock [Member]	Jul. 31, 2009 Convertible Preferred Stock [Member]	Feb. 28, 2009 Convertible Preferred Stock [Member]	Dec. 31, 2011 Interest Coverage Ratio [Member]	Dec. 31, 2011 Current Ratio [Member]	Dec. 31, 2011 Tangible Net Worth [Member]	Jun. 30, 2009 Private Placement Issuance [Member]	Jun. 30, 2009 Series 4 [Member]	Jun. 30, 2009 Term Facility [Member]	Feb. 28, 2009 Term Facility [Member]	Sep. 30, 2008 Term Facility [Member]	Dec. 31, 2010 Term Facility [Member]	Oct. 16, 2008 Bridge Facility [Member]	Feb. 28, 2009 Bridge Facility [Member]	Dec. 31, 2010 Bridge Facility [Member]	Dec. 31, 2011 Senior Secured Revolving Credit Facility [Member]	Dec. 31, 2011 Bridge Facility [Member]	Jun. 30, 2009 Prepayment Of Term Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 380,000,000	$ 140,000,000																			$ 100,000,000	$ 240,000,000
Line of Credit Facility, Amount Outstanding									220,000,000		20,000,000														18,300,000	40,000,000		40,000,000
Repayments of Long-term Lines of Credit	38,300,000																					57,200,000	8,000,000	18,300,000		37,100,000	40,000,000				18,200,000
Proceeds from Issuance of Common Stock			65,600,000	162,900,000			128,334,000					9,800,000
Stock Issued During Period, Shares, New Issues (in Shares)			32,000,000	34,400,000	17,391,302			10,200,000				4,800,000				42,621				17,400,000
Long-term Debt, Current Maturities					66,700,000		66,700,000
Issuance of Stock and Warrants for Services or Claims							4,262,000														12,200,000
Proceeds from Issuance or Sale of Equity		60,000,000
Debt Instrument, Interest Rate, Stated Percentage	9.38%
Interest Expense, Debt			2,300,000			600,000	11,300,000
Amortization of Deferred Loan Origination Fees, Net							4,000,000
Derivative, Type of Interest Rate Paid on Swap							$2.7
Stock Issued During Period, Value, New Issues (in Dollars)					43,393,000											4,300,000
Stock Issued During Period, Shares, Conversion of Convertible Securities (in Shares)														28,921	13,700
Amortization of Deferred Charges						600,000
Debt Instrument, Covenant Description													Leverage ratio (calculated as total debt divided by EBITDA) of not more than 3.0:1.				Interest coverage ratio (calculated as EBITDA divided by interest expense) of not less than 3.0:1.	Current ratio (calculated as current assets divided by current liabilities) of not less than 1.10:1.	Tangible net worth of greater than $500 million.
Capital Leases Including Purchase Option									10,300,000
Capital Lease Obligations, Current						2,481,000			4,005,000
Capital Lease Obligations, Noncurrent						3,792,000			6,265,000
Capital Lease Obligations						$ 6,300,000			$ 10,062,000