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Income Taxes - Schedule of Income Tax Asset (Liability) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current:    
Income tax asset (liability), Current, Total $ 3,721 $ 47,233
Deferred:    
Income tax asset (liability), Current, Total 13,257 800
Income tax asset (liability), Total 16,978 48,033
Federal [Member]
    
Current:    
Income tax asset (liability), Current, Total (1,074) 25,999
Deferred:    
Income tax asset (liability), Current, Total 10,968 1,661
State [Member]
    
Current:    
Income tax asset (liability), Current, Total 4,795 21,234
Deferred:    
Income tax asset (liability), Current, Total $ 2,289 $ (861)