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Accounts and Notes Receivable and Allowance for Credit Losses - Allowance for Credit Losses (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of the period	$ 24,247	$ 44,661
Recoveries	(15,357)	(31,531)
Provisions	7,887	11,117
Balance, end of the period	$ 16,777	$ 24,247

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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