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Accounts Receivable - Allowance for Doubtful Accounts Related to Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Receivables [Abstract]
Allowance for doubtful accounts beginning of period	$ 19,463	$ 15,315
Provision for bad debts	4,460	4,957
Write-offs	(4,347)	(2,530)
Allowance for doubtful accounts end of period	$ 19,576	$ 17,742

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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