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Fair Value Measurements - Assets Measured for at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed Maturities | $ 609,909 | $ 584,361
Equity Securities | 9,927 | 50,803
Short-term investments |  | 5,002
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments |  | 5,002
Total assets accounted for at fair value | 619,836 | 640,166
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 | 77,539 | 74,267
Fair Value, Measurements, Recurring | Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed Maturities | 204,203 | 191,430
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 | 209,768 | 214,776
Fair Value, Measurements, Recurring | Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed Maturities | 103,912 | 91,197
Fair Value, Measurements, Recurring | Redeemable Preferred Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed Maturities | 14,487 | 12,691
Fair Value, Measurements, Recurring | Common Stock [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities |  | 93
Fair Value, Measurements, Recurring | Mutual Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities | 9,927 | 50,710
Level 1 [Member] | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets accounted for at fair value | 9,927 | 50,803
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 |  | 93
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 | 9,927 | 50,710
Level 2 [Member] | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments |  | 5,002
Total assets accounted for at fair value | 609,909 | 589,363
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 | 77,539 | 74,267
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 | 204,203 | 191,430
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 | 209,768 | 214,776
Level 2 [Member] | Fair Value, Measurements, Recurring | Municipal Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed Maturities | 103,912 | 91,197
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 | $ 14,487 | $ 12,691

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