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Fair Value Measurements - Assets Accounted for at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 122,771 $ 117,275 $ 482,876 $ 347,392
Restricted cash and cash equivalents 2,635 2,600    
Fixed maturities 300,346 289,418    
Equity securities 60,152 65,022    
Total 360,498 354,440    
Fair Value, Measurements, Recurring [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 122,771 117,275    
Restricted cash and cash equivalents 2,635 2,600    
Total 360,498 354,440    
Total assets accounted for at fair value 485,904 474,315    
Fair Value, Measurements, Recurring [Member] | U.S. Government Obligations and Agencies [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities 115,961 104,215    
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities 93,831 94,203    
Fair Value, Measurements, Recurring [Member] | Mortgage-Backed and Asset-Backed Securities [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities 90,554 91,000    
Fair Value, Measurements, Recurring [Member] | Common Stock [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 7,250 9,295    
Fair Value, Measurements, Recurring [Member] | Mutual Funds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 52,902 55,727    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 122,771 117,275    
Restricted cash and cash equivalents 2,635 2,600    
Total 60,152 65,022    
Total assets accounted for at fair value 185,558 184,897    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government Obligations and Agencies [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities          
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate Bonds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities          
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgage-Backed and Asset-Backed Securities [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities          
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Common Stock [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 7,250 9,295    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mutual Funds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 52,902 55,727    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents          
Restricted cash and cash equivalents          
Total 300,346 289,418    
Total assets accounted for at fair value 300,346 289,418    
Fair Value, Measurements, Recurring [Member] | 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 115,961 104,215    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate Bonds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities 93,831 94,203    
Fair Value, Measurements, Recurring [Member] | 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 90,554 91,000    
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Common Stock [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities          
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mutual Funds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities          
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents          
Restricted cash and cash equivalents          
Total          
Total assets accounted for at fair value          
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Government Obligations and Agencies [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities          
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate Bonds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities          
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage-Backed and Asset-Backed Securities [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities          
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Common Stock [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities          
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mutual Funds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities