XML 91 R41.htm IDEA: XBRL DOCUMENT

Summary of Significant Accounting Policies (Allowance for Doubtful Accounts Related to Accounts Receivable) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts beginning of year	$ 15,315	$ 14,256	$ 14,764
Provision for bad debts	21,896	19,226	18,883
Write-offs	(17,748)	(18,167)	(19,391)
Allowance for doubtful accounts end of year	$ 19,463	$ 15,315	$ 14,256

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).

+ References+ Details