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Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Reconciliation [Line Items]
Gross unrecognized tax benefits, beginning of the year	$ 29,892	$ 28,316	$ 29,357
Additions for tax positions of prior years		1,894	1,518
Reductions for tax positions of prior years	(3,548)	(1,748)	(3,765)
Additions for tax positions related to the current year	958	2,764	2,231
Reductions due to settlements	(2,531)	(690)	(810)
Reductions due to lapse of applicable statute of limitations	(292)	(644)	(215)
Subtotal	24,479	29,892	28,316
Interest and penalties	3,794	4,532	3,892
Total gross unrecognized tax benefits, end of the year	$ 28,273	$ 34,424	$ 32,208

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Unrecognized Tax Benefits Before Interest And Penalties

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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 taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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