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Provisions for Federal and State Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current Income Tax Provision      
Federal $ 0 $ 0 $ 0
State 355    
Total Current Income Taxes 355    
Deferred Income Provision      
Federal 5,032 13,675 11,209
State 3,006 3,862 4,145
Total Deferred Income Taxes 8,038 17,537 15,354
Total Income Tax Expense $ 8,393 $ 17,537 $ 15,354