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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits, beginning of year	$ 845	$ 604
Tax positions taken during the current year
Increases
Decreases
Tax positions taken during a prior year
Increases	214	1,628
Decreases	(5)	(304)
Decreases for settlements during the period	(1,054)	(937)
Reductions for lapses of applicable statute of limitations		(146)
Unrecognized tax benefits, end of year		$ 845

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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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