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Income Taxes - Schedule of Income Tax Asset (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Current:    
Income tax asset , Current, Total $ 4,937 $ 10,402
Deferred:    
Income tax asset , Deferred, Total 40,492 36,849
Income tax asset (liability), Total 45,429 47,251
Federal [Member]    
Current:    
Income tax asset , Current, Total 4,399 7,414
Deferred:    
Income tax asset , Deferred, Total 31,566 28,799
State [Member]    
Current:    
Income tax asset , Current, Total 538 2,988
Deferred:    
Income tax asset , Deferred, Total $ 8,926 $ 8,050