Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents	$ 250,508	$ 167,156	$ 182,109
Income taxes recoverable	16,947	30,576
Deferred income tax asset, net	16,331	6,284
Other assets	22,031	14,877
Total assets	2,056,141	1,758,741
LIABILITIES:
Long-term debt, net	7,000
Total liabilities	1,626,439	1,309,479
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 – 47,018and 46,817 Outstanding shares – 31,221 and 31,137	470	468
Treasury shares, at cost - 15,797 and 15,680	(227,115)	(225,506)
Additional paid-in capital	108,202	103,445
Accumulated other comprehensive income (loss), net of taxes	(15,568)	3,343
Retained earnings	563,713	567,512
Total stockholders’ equity	429,702	449,262	$ 493,901	$ 501,633
Total liabilities and stockholders’ equity	2,056,141	1,758,741
Parent Company
ASSETS
Cash and cash equivalents	169,157	62,934
Investments in subsidiaries and undistributed earnings	317,166	357,375
Income taxes recoverable	16,960	30,545
Deferred income tax asset, net	3,466	6
Intercompany note receivable	20,415	0
Other assets	140	72
Total assets	527,304	450,932
LIABILITIES:
Accounts payable	17	30
Dividends payable	143	138
Long-term debt, net	96,691	0
Other accrued expenses	751	1,085
Total liabilities	97,602	1,253
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 – 47,018and 46,817 Outstanding shares – 31,221 and 31,137	470	468
Treasury shares, at cost - 15,797 and 15,680	(227,115)	(225,506)
Additional paid-in capital	108,202	103,445
Accumulated other comprehensive income (loss), net of taxes	(15,568)	3,343
Retained earnings	563,713	567,929
Total stockholders’ equity	429,702	449,679
Total liabilities and stockholders’ equity	$ 527,304	$ 450,932