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Summary of Significant Accounting Policies - Consolidated Income Tax Provision (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Tax Disclosure [Abstract]    
Current - State $ 10 $ 76
Deferred - State (454) 359
Deferred - Federal 1,026  
Total $ 582 $ 435