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Investments (Other-than-temporary Impairment) - Additional Information (Detail)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Securities
Jun. 30, 2016
USD ($)
Securities
Sep. 30, 2016
USD ($)
Securities
Sep. 30, 2015
USD ($)
Securities
Sep. 30, 2016
USD ($)
Securities
Sep. 30, 2015
USD ($)
Securities
Dec. 31, 2015
Securities
Schedule of Investments [Line Items]              
Other-than-temporary impairment losses related to credit losses     $ 224 $ 1,886 $ 1,441 $ 3,869  
Other-than-temporary impairment losses related to credit losses previously recorded     (351) (596) 230 (596)  
Other-than-temporary impairment losses     $ 575 $ 2,482 $ 1,211 $ 4,465  
Number of securities in an unrealized loss position | Securities 101   75   75   101
Number of securities had been in an unrealized loss position for 12 months or greater | Securities 10   23   23   10
Corporate Bonds [Member]              
Schedule of Investments [Line Items]              
Accumulated other-than-temporary impairment losses related to non-credit losses $ 581            
Fixed-Maturity Securities [Member]              
Schedule of Investments [Line Items]              
Other-than-temporary impairment losses, number of securities | Securities       2 1 2 2
Other-than-temporary impairment losses, number of securities sold | Securities   1     1    
Impairment loss recorded in other comprehensive income   $ 202     $ 469    
Other-than-temporary impairment losses related to credit losses     $ 180 $ 109 206 $ 109  
Other-than-temporary impairment losses related to credit losses previously recorded     351 596   596  
Other-than-temporary impairment losses     531 705 $ 675 705  
Equity Securities [Member]              
Schedule of Investments [Line Items]              
Other-than-temporary impairment losses, number of securities | Securities         16   17
Other-than-temporary impairment losses     $ 44 $ 1,777 $ 766 $ 3,760