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Income Taxes - Schedule of Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current provision:
Federal	$ 35,089	$ 9,111	$ 30,053
State	15,910	3,948	15,626
Current provision, total	50,999	13,059	45,679
Deferred provision/(benefit):
Federal	(10,102)	17,732	(15,412)
State	(3,484)	8,280	(6,463)
Deferred provision/(benefit), total	(13,586)	26,012	(21,875)
Total	$ 37,413	$ 39,071	$ 23,804

X

- 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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