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Accounts Receivable (Allowance For Doubtful Accounts Related To Accounts Receivable) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts beginning of period	$ 15,315	$ 14,256
Provision for bad debts	16,788	13,600
Write-offs	(12,108)	(12,890)
Allowance for doubtful accounts end of period	$ 19,995	$ 14,966

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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