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Income Taxes - Activities Related to Valuation Allowance (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Income Taxes [Line Items]
Balance at beginning of period	$ 28,354	$ 26,557	$ 18,025
Additions	5,993	1,797	8,532
Deductions
Balance at end of period	$ 34,347	$ 28,354	$ 26,557

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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