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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Class of Security:    
Total fixed-maturity securities $ 107,344 $ 60,641
Total investments fair value 128,315 149,492
Level 1    
Class of Security:    
Total fixed-maturity securities 77,163 20,770
Total investments fair value 98,134 109,621
Level 2    
Class of Security:    
Total fixed-maturity securities 30,181 39,871
Total investments fair value 30,181 39,871
Obligations of U.S. Government Sponsored Enterprises [Member]    
Class of Security:    
Total fixed-maturity securities 70,483 6,475
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 1    
Class of Security:    
Total fixed-maturity securities 65,993 3,009
Obligations of U.S. Government Sponsored Enterprises [Member] | Level 2    
Class of Security:    
Total fixed-maturity securities 4,490 3,466
Corporate Debt Securities [Member]    
Class of Security:    
Total fixed-maturity securities 25,700 41,484
Corporate Debt Securities [Member] | Level 1    
Class of Security:    
Total fixed-maturity securities 10,099 14,939
Corporate Debt Securities [Member] | Level 2    
Class of Security:    
Total fixed-maturity securities 15,601 26,545
Foreign Corporate Debt Securities [Member]    
Class of Security:    
Total fixed-maturity securities 11,161 12,682
Foreign Corporate Debt Securities [Member] | Level 1    
Class of Security:    
Total fixed-maturity securities 1,071 2,822
Foreign Corporate Debt Securities [Member] | Level 2    
Class of Security:    
Total fixed-maturity securities 10,090 9,860
Money Market Funds [Member]    
Class of Security:    
Total investments fair value 20,971 88,851
Money Market Funds [Member] | Level 1    
Class of Security:    
Total investments fair value $ 20,971 $ 88,851