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Income Taxes - Schedule of Income Tax Asset (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current:    
Income tax asset , Current, Total $ 14,659 $ 4,937
Deferred:    
Income tax asset , Deferred, Total 25,387 40,492
Income tax asset (liability), Total 40,046 45,429
Federal [Member]    
Current:    
Income tax asset , Current, Total 11,713 4,399
Deferred:    
Income tax asset , Deferred, Total 16,557 31,566
State [Member]    
Current:    
Income tax asset , Current, Total 2,946 538
Deferred:    
Income tax asset , Deferred, Total $ 8,830 $ 8,926