• Filing Date: 2018-03-07
  • Form Type: 10-K
  • Description: Annual report
v3.8.0.1
Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financial Assets:    
Total fixed-maturity securities $ 237,484 $ 166,248
Equity securities 58,911 53,035
Total available-for-sale securities 296,395 219,283
Trading equity securities 1,045 0
Fair Value, Measurements, Recurring [Member]    
Financial Assets:    
Cash and cash equivalents 255,884 280,531
Total fixed-maturity securities 237,484 166,248
Equity securities 58,911 53,035
Total available-for-sale securities 296,395 219,283
Trading equity securities 1,045  
Total financial assets 553,324 499,814
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Financial Assets:    
Total fixed-maturity securities 42,027 1,939
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]    
Financial Assets:    
Total fixed-maturity securities 107,103 74,504
Fair Value, Measurements, Recurring [Member] | State, Municipalities, and Political Subdivisions [Member]    
Financial Assets:    
Total fixed-maturity securities 80,695 78,306
Fair Value, Measurements, Recurring [Member] | Exchange-Traded Debt [Member]    
Financial Assets:    
Total fixed-maturity securities 7,659 11,262
Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock [Member]    
Financial Assets:    
Total fixed-maturity securities   237
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member]    
Financial Assets:    
Cash and cash equivalents 255,884 280,531
Total fixed-maturity securities 154,295 86,957
Equity securities 58,911 53,035
Total available-for-sale securities 213,206 139,992
Trading equity securities 1,045  
Total financial assets 470,135 420,523
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Financial Assets:    
Total fixed-maturity securities 40,527 1,939
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Corporate Bonds [Member]    
Financial Assets:    
Total fixed-maturity securities 106,109 73,519
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Exchange-Traded Debt [Member]    
Financial Assets:    
Total fixed-maturity securities 7,659 11,262
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Redeemable Preferred Stock [Member]    
Financial Assets:    
Total fixed-maturity securities   237
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member]    
Financial Assets:    
Total fixed-maturity securities 83,189 79,291
Total available-for-sale securities 83,189 79,291
Total financial assets 83,189 79,291
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Financial Assets:    
Total fixed-maturity securities 1,500  
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Corporate Bonds [Member]    
Financial Assets:    
Total fixed-maturity securities 994 985
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | State, Municipalities, and Political Subdivisions [Member]    
Financial Assets:    
Total fixed-maturity securities $ 80,695 $ 78,306