• Filing Date: 2017-02-22
  • Form Type: 10-K
  • Description: Annual report
v3.6.0.2
Investments (Other-than-temporary Impairment) - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Securities
Dec. 31, 2016
USD ($)
Securities
Dec. 31, 2015
USD ($)
Securities
Dec. 31, 2014
USD ($)
Securities
Schedule of Investments [Line Items]        
Other-than-temporary impairment losses   $ 2,482 $ 4,681 $ 107
Other-than-temporary impairment losses related to additional loss   $ 2,252 $ 5,275 $ 107
Number of securities in an unrealized loss position | Securities 101 134 101  
Number of securities had been in an unrealized loss position for 12 months or longer | Securities 10 20 10  
Fixed-Maturity Securities [Member]        
Schedule of Investments [Line Items]        
Other-than-temporary impairment losses, number of securities | Securities   3 2 0
Other-than-temporary impairment losses, number of securities sold | Securities   1    
Impairment loss recorded in other comprehensive income   $ 230    
Other-than-temporary impairment losses   1,565 $ 705  
Other-than-temporary impairment losses related to additional loss   1,335    
Other-than-temporary impairment losses related to credit losses     111  
Accumulated other-than-temporary impairment losses related to non-credit losses     $ 594  
Fixed-Maturity Securities [Member] | Previously Impaired Fixed-Maturity Security Sold [Member]        
Schedule of Investments [Line Items]        
Impairment loss recorded in other comprehensive income   $ 202    
Equity Securities [Member]        
Schedule of Investments [Line Items]        
Other-than-temporary impairment losses, number of securities | Securities   9 17 1
Other-than-temporary impairment losses related to additional loss   $ 917 $ 4,570 $ 107
Corporate Bonds [Member]        
Schedule of Investments [Line Items]        
Accumulated other-than-temporary impairment losses related to non-credit losses $ 581 $ 76