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Income Taxes - Schedule of Activity Related to Gross Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unrecognized Tax Benefits [Line Items]
Balance at beginning of year	$ 16,165	$ 22,290	$ 49,416
Increases related to prior year tax positions	102	44	948
Decreases related to prior year tax positions			(9,569)
Increases related to current year tax positions	2,478	2,541	2,334
Decreases related to current year tax positions	(3,671)	(7,203)	(19,035)
Settlements		13	(500)
Decreases related to lapse of statutes of limitations	(2,002)	(1,520)	(1,304)
Balance at end of year	$ 13,072	$ 16,165	$ 22,290

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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