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Components of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 17,448	$ 6,070	$ (615)
State	2,528	1,275	61
Foreign	1,027	535	402
Deferred:
Federal	(590)	4,691	4,389
State	(387)	584	953
Total income tax expense (benefit)	$ 20,026	$ 13,155	$ 5,190

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- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable Income or Loss from continuing operations.

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