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Premiums Receivable - Components of Premiums Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Premiums Receivable, Net [Abstract]        
Premiums receivable $ 179,460 $ 188,217    
Allowance for doubtful accounts (5,226) (5,212) $ (4,852) $ (5,211)
Premiums receivable, net $ 174,234 $ 183,005