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Schedule 1 - Valuation and Qualifying Accounts (Detail) - Valuation and Qualifying Accounts (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Tax valuation allowance	$ 54,788	$ 50,312	$ 47,350
Tax valuation allowance	5,253	4,476	2,962
Tax valuation allowance	0	0	0
Tax valuation allowance	0	0	0
Tax valuation allowance	$ 60,041	$ 54,788	$ 50,312

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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