Fair Value - Presentation of Fair-Value Measurements for Each Major Category of Assets Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	$ 132,762	$ 139,046
Fair Value Measurements Using [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	132,762	139,046
Limited partnership interests	1,727
Cash and cash equivalents	74,382	59,104
Total	208,871	198,150
Fair Value Measurements Using [Member] | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	122,125	130,713
Fair Value Measurements Using [Member] | Debt Securities [Member] | U.S. Government and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	11,872	12,110
Fair Value Measurements Using [Member] | Debt Securities [Member] | State [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	3,044	4,111
Fair Value Measurements Using [Member] | Debt Securities [Member] | Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	773	790
Fair Value Measurements Using [Member] | Debt Securities [Member] | Revenue and Assessment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	16,134	17,996
Fair Value Measurements Using [Member] | Debt Securities [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	69,320	71,537
Fair Value Measurements Using [Member] | Debt Securities [Member] | Agency Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	9,334	11,870
Fair Value Measurements Using [Member] | Debt Securities [Member] | Non-Agency Backed - Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	5,102	5,472
Fair Value Measurements Using [Member] | Debt Securities [Member] | Non-Agency Backed - Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	4,853	5,109
Fair Value Measurements Using [Member] | Debt Securities [Member] | Redeemable Preferred Stocks [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	1,693	1,718
Fair Value Measurements Using [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual fund, available-for-sale	10,637	8,333
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Using [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	24,202	22,161
Cash and cash equivalents	74,382	59,104
Total	98,584	81,265
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	13,565	13,828
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member] | U.S. Government and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	11,872	12,110
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member] | Redeemable Preferred Stocks [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	1,693	1,718
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value Measurements Using [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mutual fund, available-for-sale	10,637	8,333
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Using [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	108,560	116,885
Total	108,560	116,885
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	108,560	116,885
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member] | State [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	3,044	4,111
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member] | Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	773	790
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member] | Revenue and Assessment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	16,134	17,996
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	69,320	71,537
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member] | Agency Backed [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	9,334	11,870
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member] | Non-Agency Backed - Residential [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	5,102	5,472
Significant Other Observable Inputs (Level 2) [Member] | Fair Value Measurements Using [Member] | Debt Securities [Member] | Non-Agency Backed - Commercial [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	4,853	5,109
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total fixed maturities, available-for-sale	0	0	0	0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value Measurements Using [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Limited partnership interests	1,727
Total	$ 1,727