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Components of Income Tax Expense from Continuing Operations (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 tax expense (benefit)                      
Federal                 $ 13,733 $ 7,101 $ (5,268)
State                 1,291 110 78
Current Income Tax Expense (Benefit), Total                 15,024 7,211 (5,190)
Deferred tax expense                      
Federal                 (1,501) 1,650 12,397
State                 605 712 611
Deferred income tax (benefit) expense                 (896) 2,362 13,008
Total income tax expense $ 3,957 $ 5,322 $ 1,997 $ 2,852 $ 2,151 $ 2,502 $ 2,572 $ 2,348 $ 14,128 $ 9,573 $ 7,818