XML 71 R58.htm IDEA: XBRL DOCUMENT v3.10.0.1
Premiums Receivable - Summary of Activity in Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Premiums Receivable, Allowance for Doubtful Accounts [Roll Forward]      
Balance, beginning of year $ 5,226 $ 5,212 $ 4,852
Provision for bad debts 883 1,394 1,646
Write-offs (719) (1,380) (1,286)
Balance, end of year $ 5,390 $ 5,226 $ 5,212