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Fair Value Measurements - Assets Accounted for at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 170,352 $ 117,275 $ 137,286 $ 347,392
Restricted cash and cash equivalents 6,597 2,600    
Fixed maturities 328,010 289,418    
Equity securities 20,387 65,022    
Short-term Investments 37,473      
Total Investments 385,870 354,440    
Mortgage-Backed and Asset-Backed Securities [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Investments 95,238 91,000    
Short-term Investments [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Total Investments 37,473      
Fair Value, Measurements, Recurring
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 170,352 117,275    
Restricted cash and cash equivalents 6,597 2,600    
Total Investments 385,870 354,440    
Total assets accounted for at fair value 562,819 474,315    
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 116,083 104,215    
Fair Value, Measurements, Recurring | Corporate Bonds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities 109,837 94,203    
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 95,238 91,000    
Fair Value, Measurements, Recurring | Redeemable Preferred Stock [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities 6,852      
Fair Value, Measurements, Recurring | Common Stock [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 250 9,295    
Fair Value, Measurements, Recurring | Mutual Funds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 20,137 55,727    
Fair Value, Measurements, Recurring | Short-term Investments [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term Investments 37,473      
Level 1 [Member] | Fair Value, Measurements, Recurring
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 170,352 117,275    
Restricted cash and cash equivalents 6,597 2,600    
Total Investments 32,887 65,022    
Total assets accounted for at fair value 209,836 184,897    
Level 1 [Member] | Fair Value, Measurements, Recurring | Common Stock [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 250 9,295    
Level 1 [Member] | Fair Value, Measurements, Recurring | Mutual Funds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Equity securities 20,137 55,727    
Level 1 [Member] | Fair Value, Measurements, Recurring | Short-term Investments [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term Investments 12,500      
Level 2 [Member] | Fair Value, Measurements, Recurring
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents   0    
Restricted cash and cash equivalents   0    
Total Investments 352,983 289,418    
Total assets accounted for at fair value 352,983 289,418    
Level 2 [Member] | 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 116,083 104,215    
Level 2 [Member] | Fair Value, Measurements, Recurring | Corporate Bonds [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities 109,837 94,203    
Level 2 [Member] | 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 95,238 91,000    
Level 2 [Member] | Fair Value, Measurements, Recurring | Redeemable Preferred Stock [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fixed maturities 6,852      
Level 2 [Member] | Fair Value, Measurements, Recurring | Short-term Investments [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Short-term Investments $ 24,973