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Income Taxes - Schedule of Income Tax Asset (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Current:    
Income tax asset , Current, Total $ 10,402 $ 8,959
Deferred:    
Income tax asset , Deferred, Total 36,849 22,502
Income tax asset (liability), Total 47,251 31,461
Federal [Member]    
Current:    
Income tax asset , Current, Total 7,414 4,522
Deferred:    
Income tax asset , Deferred, Total 28,799 18,304
State [Member]    
Current:    
Income tax asset , Current, Total 2,998 4,437
Deferred:    
Income tax asset , Deferred, Total $ 8,050 $ 4,198