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Fair Value Measurements - Assets Measured for at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities $ 577,810 $ 416,083
Equity securities 35,543 42,214
Short-term investments 5,004 25,021
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 5,004 25,021
Total assets accounted for at fair value 618,357 483,318
Fair Value, Measurements, Recurring | U.S. Government Obligations and Agencies and Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 146,579  
Fair Value, Measurements, Recurring | Corporate Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 188,569 125,517
Fair Value, Measurements, Recurring | Mortgage-Backed and Asset-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 232,231 150,160
Fair Value, Measurements, Recurring | Redeemable Preferred Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 10,431 10,065
Fair Value, Measurements, Recurring | Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 3,086 10,762
Fair Value, Measurements, Recurring | Mutual Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 32,457 31,452
Fair Value, Measurements, Recurring | U.S. Government Obligations and Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities   125,342
Fair Value, Measurements, Recurring | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities   4,999
Fair Value, Measurements, Recurring | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total assets accounted for at fair value 35,543 42,214
Fair Value, Measurements, Recurring | Level 1 [Member] | Common Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 3,086 10,762
Fair Value, Measurements, Recurring | Level 1 [Member] | Mutual Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 32,457 31,452
Fair Value, Measurements, Recurring | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 5,004 25,021
Total assets accounted for at fair value 582,814 441,104
Fair Value, Measurements, Recurring | Level 2 [Member] | U.S. Government Obligations and Agencies and Municipal Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 146,579  
Fair Value, Measurements, Recurring | Level 2 [Member] | Corporate Bonds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 188,569 125,517
Fair Value, Measurements, Recurring | Level 2 [Member] | Mortgage-Backed and Asset-Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities 232,231 150,160
Fair Value, Measurements, Recurring | Level 2 [Member] | Redeemable Preferred Stock [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities $ 10,431 10,065
Fair Value, Measurements, Recurring | Level 2 [Member] | U.S. Government Obligations and Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities   125,342
Fair Value, Measurements, Recurring | Level 2 [Member] | Other [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities   $ 4,999