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Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ (6,468)	$ 37,380	$ 46,084	$ 40,055	$ 36,396	$ 9,964	$ 29,376	$ 31,199	$ 117,051	$ 106,935	$ 99,410
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation									4,820	4,058	3,242
Amortization of share-based compensation									12,786	10,515	10,288
Amortization of original issue discount on debt									0	10	149
Accretion of deferred credit									0	0	(149)
Net realized (gains) losses sale of securities									2,089	(2,570)	(2,294)
Net change in unrealized gains (losses) of equity securities	(8,000)								(17,169)	0	0
Deferred income taxes									(3,740)	1,309	4,724
Excess tax benefits from share-based compensation									(5,427)	(5,793)	1,154
Issuance of common stock									0	634	0
Net change in assets and liabilities relating to operating activities:
Income taxes recoverable									3,741	(417)	1,004
Other liabilities and accrued expenses									289	9,287	(505)
Net cash provided by (used in) operating activities									230,105	245,010	121,396
Cash flows from investing activities:
Purchases of equity securities, available for sale									(25,803)	(89,302)	(66,688)
Purchase of fixed maturities, available for sale									(437,635)	(180,604)	(320,131)
Proceeds from sales of equity securities, available for sale									8,285	77,640	60,558
Proceeds from sales of fixed maturities, available for sale									134,591	26,179	86,018
Net cash provided by (used in) investing activities									(212,286)	(85,709)	(174,311)
Cash flows from financing activities:
Repayment of debt									(1,471)	(2,170)	(2,136)
Preferred stock dividend									(10)	(10)	(10)
Common stock dividend									(25,508)	(24,001)	(24,192)
Issuance of common stock for stock option exercises									102	0	119
Purchase of treasury stock									(25,276)	(18,141)	(8,510)
Sale of treasury stock									0	0	2,965
Payments related to tax withholding for share-based compensation									(12,714)	(7,223)	(5,451)
Excess tax benefit (shortfall) from share-based compensation									0	0	(1,154)
Net cash provided by (used in) financing activities									(64,877)	(51,545)	(38,369)
Net increase (decrease) during the period									(47,058)	107,756	(91,284)
Balance, beginning of period				216,121				108,365	216,121	108,365	199,649
Balance, end of period	169,063				216,121				169,063	216,121	108,365
Parent Company
Cash flows from operating activities:
Net income									117,502	106,935	99,410
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in net income of subsidiaries									(139,987)	(118,781)	(121,847)
Distribution of income from subsidiaries									96,561	122,156	46,914
Depreciation									11	3	2
Amortization of share-based compensation									12,786	10,515	10,288
Amortization of original issue discount on debt									0	10	149
Accretion of deferred credit									0	0	(149)
Net realized (gains) losses sale of securities									0	(255)	(667)
Net change in unrealized gains (losses) of equity securities									(2,648)	0	0
Deferred income taxes									115	1,309	4,724
Excess tax benefits from share-based compensation									(5,427)	(5,793)	1,154
Issuance of common stock									0	634	0
Net change in assets and liabilities relating to operating activities:
Income taxes recoverable									3,763	(417)	1,004
Other operating assets and liabilities									169	574	(596)
Other liabilities and accrued expenses									(835)	778	(2,896)
Net cash provided by (used in) operating activities									87,306	117,668	37,490
Cash flows from investing activities:
Purchases of equity securities, available for sale									(35)	(4,990)	(2,037)
Purchase of fixed maturities, available for sale									0	(3,000)	(3,000)
Proceeds from sales of equity securities, available for sale									0	3,255	2,456
Proceeds from sales of fixed maturities, available for sale									0	0	3,229
Net cash provided by (used in) investing activities									(35)	(4,735)	648
Cash flows from financing activities:
Repayment of debt									0	0	0
Preferred stock dividend									(10)	(10)	(10)
Common stock dividend									(25,508)	(24,001)	(24,192)
Issuance of common stock for stock option exercises									102	0	119
Purchase of treasury stock									(25,276)	(18,141)	(8,510)
Sale of treasury stock									0	0	2,965
Payments related to tax withholding for share-based compensation									(12,714)	(7,223)	(5,451)
Excess tax benefit (shortfall) from share-based compensation									0	0	(1,154)
Net cash provided by (used in) financing activities									(63,406)	(49,375)	(36,233)
Net increase (decrease) during the period									23,865	63,558	1,905
Balance, beginning of period				$ 67,509				$ 3,951	67,509	3,951	2,046
Balance, end of period	$ 91,374				$ 67,509				$ 91,374	$ 67,509	$ 3,951

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