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Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financial Assets:    
Total fixed-maturity securities $ 133,113 $ 112,151
Equity securities 22,872 17,649
Total available-for-sale securities 155,985 129,800
Fair Value, Measurements, Recurring [Member]
   
Financial Assets:    
Cash and cash equivalents 296,576 293,398
Total available-for-sale securities 155,985 129,800
Total 452,561 423,198
Financial Liabilities:    
Total long-term debt 130,676 130,020
Fair Value, Measurements, Recurring [Member] | Senior Notes [Member]
   
Financial Liabilities:    
Total long-term debt 43,438 43,390
Fair Value, Measurements, Recurring [Member] | Convertible Debt [Member]
   
Financial Liabilities:    
Total long-term debt 87,238 86,630
Fair Value, Measurements, Recurring [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 133,113 112,151
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
   
Financial Assets:    
Equity securities 22,872 17,649
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 4,453 4,564
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 30,772 25,404
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 11,278 11,332
Fair Value, Measurements, Recurring [Member] | State, Municipalities, and Political Subdivisions [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 83,045 70,451
Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 3,565 400
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member]
   
Financial Assets:    
Cash and cash equivalents 296,576 293,398
Total available-for-sale securities 59,885 46,045
Total 356,461 339,443
Financial Liabilities:    
Total long-term debt      
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Senior Notes [Member]
   
Financial Liabilities:    
Total long-term debt      
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Convertible Debt [Member]
   
Financial Liabilities:    
Total long-term debt      
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 37,013 28,396
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Equity Securities [Member]
   
Financial Assets:    
Equity securities 22,872 17,649
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 3,611 3,520
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Corporate Bonds [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 29,837 24,476
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Commercial Mortgage-Backed Securities [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities      
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | State, Municipalities, and Political Subdivisions [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities      
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Redeemable Preferred Stock [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 3,565 400
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member]
   
Financial Assets:    
Cash and cash equivalents      
Total available-for-sale securities 96,100 83,755
Total 96,100 83,755
Financial Liabilities:    
Total long-term debt 43,438 43,390
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Senior Notes [Member]
   
Financial Liabilities:    
Total long-term debt 43,438 43,390
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Convertible Debt [Member]
   
Financial Liabilities:    
Total long-term debt      
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 96,100 83,755
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Equity Securities [Member]
   
Financial Assets:    
Equity securities      
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 842 1,044
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Corporate Bonds [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 935 928
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Commercial Mortgage-Backed Securities [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 11,278 11,332
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | State, Municipalities, and Political Subdivisions [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities 83,045 70,451
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Redeemable Preferred Stock [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities      
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member]
   
Financial Assets:    
Cash and cash equivalents      
Total available-for-sale securities      
Total      
Financial Liabilities:    
Total long-term debt 87,238 86,630
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Senior Notes [Member]
   
Financial Liabilities:    
Total long-term debt      
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Convertible Debt [Member]
   
Financial Liabilities:    
Total long-term debt 87,238 86,630
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities      
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Equity Securities [Member]
   
Financial Assets:    
Equity securities      
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | U.S. Treasury and U.S. Government Agencies [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities      
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Corporate Bonds [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities      
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Commercial Mortgage-Backed Securities [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities      
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | State, Municipalities, and Political Subdivisions [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities      
Fair Value, Measurements, Recurring [Member] | (Level 3) [Member] | Redeemable Preferred Stock [Member] | Fixed-Maturity Securities [Member]
   
Financial Assets:    
Total fixed-maturity securities