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Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 213,486 | $ 105,730 | $ 197,014 | $ 115,397
Fixed maturities, at fair value | 639,334 | 584,361 |  |
Equity securities, at fair value | 62,215 | 50,803 |  |
Income taxes recoverable | 9,472 | 3,262 |  |
Deferred income taxes | 9,286 | 10,674 |  |
Other assets | 12,461 | 10,707 |  |
Total assets | 1,454,999 | 1,060,007 |  |
LIABILITIES: |  |  |  |
Accounts payable | 2,866 | 3,187 |  |
Other accrued expenses | 45,096 | 37,665 |  |
Total liabilities | 1,015,011 | 688,817 |  |
STOCKHOLDERS' EQUITY: |  |  |  |
Cumulative convertible preferred stock, $.01 par value Authorized shares - 1,000 Issued shares - 10 and 10 Outstanding shares - 10 and 10 Minimum liquidation preference - $9.99 and $9.99 per share |  |  |  |
Common stock, $.01 par value Authorized shares - 55,000 Issued shares – 45,778 and 45,324 Outstanding shares – 34,735 and 35,052 | 458 | 453 |  |
Treasury shares, at cost - 11,043 and 10,272 | (105,123) | (86,982) |  |
Additional paid-in capital | 86,186 | 82,263 |  |
Accumulated other comprehensive income (loss), net of taxes | (6,281) | (6,408) |  |
Retained earnings | 464,748 | 381,864 |  |
Total stockholders' equity | 439,988 | 371,190 | 293,092 | 199,916
Total liabilities and stockholders' equity | 1,454,999 | 1,060,007 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 67,509 | 3,951 | $ 2,046 | $ 14,890
Investments in subsidiaries and undistributed earnings | 359,847 | 362,759 |  |
Fixed maturities, at fair value | 3,111 | 3,003 |  |
Equity securities, at fair value | 5,238 | 625 |  |
Income taxes recoverable | 9,472 | 3,262 |  |
Deferred income taxes | 9,286 | 10,674 |  |
Other assets | 431 | 1,003 |  |
Total assets | 454,894 | 385,277 |  |
LIABILITIES: |  |  |  |
Accounts payable | 4 | 50 |  |
Dividends payable | 40 |  |  |
Other accrued expenses | 14,862 | 14,037 |  |
Total liabilities | 14,906 | 14,087 |  |
STOCKHOLDERS' EQUITY: |  |  |  |
Cumulative convertible preferred stock, $.01 par value Authorized shares - 1,000 Issued shares - 10 and 10 Outstanding shares - 10 and 10 Minimum liquidation preference - $9.99 and $9.99 per share |  |  |  |
Common stock, $.01 par value Authorized shares - 55,000 Issued shares – 45,778 and 45,324 Outstanding shares – 34,735 and 35,052 | 458 | 453 |  |
Treasury shares, at cost - 11,043 and 10,272 | (105,123) | (86,982) |  |
Additional paid-in capital | 86,186 | 82,263 |  |
Accumulated other comprehensive income (loss), net of taxes | (6,281) | (6,408) |  |
Retained earnings | 464,748 | 381,864 |  |
Total stockholders' equity | 439,988 | 371,190 |  |
Total liabilities and stockholders' equity | $ 454,894 | $ 385,277 |  |

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