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Income Taxes - Components of Income Taxes Expense (Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:                      
Federal                 $ 36,818 $ 7,441 $ 22,522
State                 7,575 2,737 5,163
Current Income Tax Expense (Benefit), Total                 44,393 10,178 27,685
Deferred:                      
Federal                 (448) 18,125 (2,956)
State                 32 2,679 (2,480)
Deferred Income Tax Expense (Benefit)                 (416) 20,804 (5,436)
Income Tax Expense (Benefit), Total $ 12,097 $ 12,594 $ 9,748 $ 9,538 $ 7,584 $ 7,643 $ 9,141 $ 6,614 $ 43,977 $ 30,982 $ 22,249