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Investments - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Securities
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Investment [Line Items]      
Short-term investments $ 7,718 $ 33,684  
Carrying value of investments $ 12,200    
Individual fixed maturity held in unrealized loss position | Securities 198    
Individual fixed maturity held in unrealized loss position longer than 12 months | Securities 29    
Number of fixed maturity securities to be deemed other-than-temporarily impaired | Securities 4    
Impairment losses recognized $ 2,653 222 $ 2,229
Held-to-Maturity Securities [Member]      
Investment [Line Items]      
Cash or cash held by insurance regulators 20,300    
Fixed Maturity Securities Available for Sale [Member]      
Investment [Line Items]      
Impairment losses recognized 2,653 222  
Cash [Member]      
Investment [Line Items]      
Cash or cash held by insurance regulators 1,500    
Corporate Bonds [Member]      
Investment [Line Items]      
Short-term investments $ 7,700 32,700  
Certificates of Deposit [Member]      
Investment [Line Items]      
Short-term investments   $ 1,000