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Allowance for Credit Losses (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance, beginning of the period	$ 24,247	$ 44,661
Recoveries	(15,923)	(27,539)
Provisions	8,634	10,066
Balance, end of the period	$ 16,958	$ 27,188

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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