Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Other amounts the seller-lessee is required to pay under the terms of the transaction involving the sale of property to another party and lease of the property back to the seller, including reimbursements for such items, as utilities, taxes, insurance and common area maintenance.

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Long-term debt - WCS - Additional Information (Detail) (WCS [Member], USD $)	12 Months Ended				3 Months Ended
	Dec. 31, 2012 Vendor construction retainage promissory note [Member]	Dec. 31, 2011 Vendor construction retainage promissory note [Member]	Dec. 31, 2010 Vendor construction retainage promissory note [Member]	Dec. 31, 2012 Andrews County capital lease [Member]	Mar. 31, 2010 Former customer promissory note [Member]	Dec. 31, 2012 Former customer promissory note [Member]	Apr. 30, 2010 Former customer promissory note [Member]
Debt Instrument [Line Items]
Gross proceeds sale of property and equipment				$ 75,000,000
Lease Agreement period				25 years
Lease agreement cost				2,600,000
Capital lease agreement interest rate				7.00%
Aggregate rental due				6,200,000
Principal amount of debt instrument			5,820,000				12,000,000
Long-term promissory note fixed interest rate						6.00%
Contract termination expense					1,100,000
Carrying amount of debt			2,400,000			4,800,000
Non-interest bearing promissory note			6,600,000
Promissory note due date			Dec. 31, 2013
Note calls for payments	2,500,000	2,400,000	1,700,000
Percentage of discount on promissory note			6.00%
Accrued construction retainage payable			$ 1,400,000