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Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 182,109 | $ 166,428 | $ 213,486 |
Available-for-sale debt securities, at fair value | 855,284 | 820,438 |  |
Equity securities, at fair value | 43,717 | 63,277 |  |
Income taxes recoverable | 34,283 | 11,159 |  |
Deferred income tax asset, net | 3,351 | 14,586 |  |
Other assets | 17,328 | 14,540 |  |
Total assets | 1,719,852 | 1,858,390 |  |
LIABILITIES: |  |  |  |
Accounts payable | 2,099 | 3,059 |  |
Total liabilities | 1,225,951 | 1,356,757 |  |
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 | 0 | 0 |  |
Common stock, $.01 par value Authorized shares - 55,000 Issued shares – 46,707 and 46,514 Outstanding shares – 32,638 and 34,783 | 467 | 465 |  |
Treasury shares, at cost - 14,069 and 11,731 | (196,585) | (130,399) |  |
Additional paid-in capital | 96,036 | 86,353 |  |
Accumulated other comprehensive income (loss), net of taxes | 20,364 | (8,010) |  |
Retained earnings | 573,619 | 553,224 |  |
Total stockholders’ equity | 493,901 | 501,633 | $ 439,988 | $ 371,190
Total liabilities and stockholders’ equity | 1,719,852 | 1,858,390 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 86,508 | 91,374 |  |
Investments in subsidiaries and undistributed earnings | 378,906 | 401,296 |  |
Available-for-sale debt securities, at fair value | 808 | 2,986 |  |
Equity securities, at fair value | 0 | 2,626 |  |
Income taxes recoverable | 34,253 | 11,136 |  |
Deferred income tax asset, net | 0 | 6,512 |  |
Other assets | 149 | 261 |  |
Total assets | 500,624 | 516,191 |  |
LIABILITIES: |  |  |  |
Accounts payable | 20 | 29 |  |
Deferred income tax liability, net | 2,602 | 0 |  |
Dividends payable | 80 | 77 |  |
Other accrued expenses | 3,587 | 14,001 |  |
Total liabilities | 6,289 | 14,107 |  |
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 | 0 | 0 |  |
Common stock, $.01 par value Authorized shares - 55,000 Issued shares – 46,707 and 46,514 Outstanding shares – 32,638 and 34,783 | 467 | 465 |  |
Treasury shares, at cost - 14,069 and 11,731 | (196,585) | (130,399) |  |
Additional paid-in capital | 96,036 | 86,353 |  |
Accumulated other comprehensive income (loss), net of taxes | 20,364 | (8,010) |  |
Retained earnings | 574,053 | 553,675 |  |
Total stockholders’ equity | 494,335 | 502,084 |  |
Total liabilities and stockholders’ equity | $ 500,624 | $ 516,191 |  |

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