XML 72 R59.htm IDEA: XBRL DOCUMENT v3.22.0.1
Premiums Receivable - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Premiums Receivable, Net [Abstract]      
Earned but Unbilled $ 7.9 $ 6.3 $ 8.5