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Premiums Receivable - Components of Premiums Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Premiums Receivable, Net [Abstract]        
Premiums receivable $ 190,216 $ 184,128    
Allowance for doubtful accounts (4,852) (5,211) $ (5,458) $ (6,424)
Premiums receivable, net $ 185,364 $ 178,917