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Schedule of Credit Losses Recognized in Earnings (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Investments Debt And Equity Securities [Abstract]    
Balance at beginning of period $ 13 $ 13
Additions where no OTTI was previously recorded 0 0
Additions where an OTTI was previously recorded 0 0
Reductions for securities for which the company intends to sell or more likely than not will be required to sell before recovery 0 0
Reductions reflecting increases in expected cash flows to be collected 0 0
Reductions for securities sold during the period 0 0
Balance at end of period $ 13 $ 13