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Supplemental Financial Information - Changes in Provision for Bad Debts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for bad debts, beginning of year	$ 6,867	$ 31,908	$ 41,698
Provision for bad debts		5,688
Recovery of bad debts	(1,018)	(12,401)	(9,789)
Total bad debt expense (recovery)	(1,018)	(6,713)	(9,789)
Write off of uncollectible accounts against reserve	(391)	(18,380)
Other		52	(1)
Allowance for bad debts, end of year	$ 5,458	$ 6,867	$ 31,908

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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