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Fair Value Measurements - Available-for-Sale Securities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financial Assets:    
Total fixed-maturity securities $ 170,016 $ 125,009
Equity securities 51,460 48,237
Total available-for-sale securities 221,476 173,246
Fair Value, Measurements, Recurring [Member]    
Financial Assets:    
Cash and cash equivalents 291,880 267,738
Total fixed-maturity securities 170,016 125,009
Equity securities 51,460 48,237
Total available-for-sale securities 221,476 173,246
Total financial assets 513,356 440,984
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Financial Assets:    
Total fixed-maturity securities 440 113
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]    
Financial Assets:    
Total fixed-maturity securities 77,248 37,819
Fair Value, Measurements, Recurring [Member] | State, Municipalities, and Political Subdivisions [Member]    
Financial Assets:    
Total fixed-maturity securities 79,767 77,324
Fair Value, Measurements, Recurring [Member] | Exchange-Traded Debt [Member]    
Financial Assets:    
Total fixed-maturity securities 12,316 9,429
Fair Value, Measurements, Recurring [Member] | Redeemable Preferred Stock [Member]    
Financial Assets:    
Total fixed-maturity securities 245 324
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member]    
Financial Assets:    
Cash and cash equivalents 291,880 267,738
Total fixed-maturity securities 89,265 46,702
Equity securities 51,460 48,237
Total available-for-sale securities 140,725 94,939
Total financial assets 432,605 362,677
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | U.S. Treasury and U.S. Government Agencies [Member]    
Financial Assets:    
Total fixed-maturity securities 440 113
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Corporate Bonds [Member]    
Financial Assets:    
Total fixed-maturity securities 76,264 36,836
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Exchange-Traded Debt [Member]    
Financial Assets:    
Total fixed-maturity securities 12,316 9,429
Fair Value, Measurements, Recurring [Member] | (Level 1) [Member] | Redeemable Preferred Stock [Member]    
Financial Assets:    
Total fixed-maturity securities 245 324
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member]    
Financial Assets:    
Total fixed-maturity securities 80,751 78,307
Total available-for-sale securities 80,751 78,307
Total financial assets 80,751 78,307
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | Corporate Bonds [Member]    
Financial Assets:    
Total fixed-maturity securities 984 983
Fair Value, Measurements, Recurring [Member] | (Level 2) [Member] | State, Municipalities, and Political Subdivisions [Member]    
Financial Assets:    
Total fixed-maturity securities $ 79,767 $ 77,324