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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

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