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Income Taxes - Schedule of Income Tax Asset (Liability) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current:    
Income tax asset (liability), Current, Total $ 4,175 $ 3,721
Deferred:    
Income tax asset (liability), Current, Total 55,611 13,257
Income tax asset (liability), Total 59,786 16,978
Federal [Member]
    
Current:    
Income tax asset (liability), Current, Total 2,838 (1,074)
Deferred:    
Income tax asset (liability), Current, Total 42,545 10,968
State [Member]
    
Current:    
Income tax asset (liability), Current, Total 1,337 4,795
Deferred:    
Income tax asset (liability), Current, Total $ 13,066 $ 2,289