• Filing Date: 2020-03-06
  • Form Type: 10-K
  • Description: Annual report
v3.19.3.a.u2
Investments (Net Investment Income) - Additional Information (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Bank
Account
Dec. 31, 2018
USD ($)
Bank
Account
Schedule of Investments [Line Items]    
Cash and cash equivalents $ 229,218 $ 239,458
Deposits representing cash and cash equivalents in percentage 55.10% 75.40%
Number of national banks | Bank 3 3
Number of custodial accounts | Account 2 2
Federal Deposit Insurance Corporation's coverage limit for insured deposit accounts $ 250 $ 250
Custodial Accounts [Member]    
Schedule of Investments [Line Items]    
Cash and cash equivalents 12,188 73,511
Bank Deposits [Member]    
Schedule of Investments [Line Items]    
Cash and cash equivalents $ 126,347 $ 180,508