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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Significant Accounting Policies [Line Items]
(Gain) loss on fuel call options			$ (24,803,000)	$ 7,348,000
Taxes directly imposed on a revenue-producing transaction between a seller and a customer	$ 103,200,000	$ 94,100,000	$ 198,900,000	$ 175,400,000

The amount of excise and sales taxes included in sales and revenues, which are then deducted as a cost of sales. Includes excise taxes, which are applied to specific types of transactions or items (such as gasoline or alcohol); and sales, use and value added taxes, which are applied to a broad class of revenue-producing transactions involving a wide range of goods and services.

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