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Detail of Certain Balance Sheet Accounts - Current and Long-Term Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance For Doubtful Accounts Receivable [Line Items]
Balance at beginning of year	$ 3,751	$ 5,962
Charged to expense	3,693	1,163	(142)
Deductions for uncollectible receivables written off, net of recoveries	(1,997)	(3,374)
Balance at end of year	$ 5,447	$ 3,751	$ 5,962

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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