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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:                      
Net income $ 36,396 $ 9,964 $ 29,376 $ 31,199 $ 13,655 $ 26,882 $ 33,647 $ 25,226 $ 106,935 $ 99,410 $ 106,484
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Depreciation                 4,058 3,242 2,033
Amortization of share-based compensation                 10,515 10,288 17,386
Amortization of original issue discount on debt                 10 149 521
Accretion of deferred credit                   (149) (521)
Net realized (gains) losses on investments                 (2,570) (2,294) (1,060)
Deferred income taxes                 1,309 4,724 (693)
Excess tax benefits from share-based compensation                 (5,793) 1,154 (5,310)
Issuance of common stock                 634    
Net change in assets and liabilities relating to operating activities:                      
Income taxes recoverable                 (417) 1,004 255
Income taxes payable                     3,510
Other liabilities and accrued expenses                 9,287 (505) 625
Net cash provided by (used in) operating activities                 245,010 121,396 219,271
Cash flows from investing activities:                      
Purchases of equity securities, available for sale                 (89,302) (66,688) (65,038)
Purchase of fixed maturities, available for sale                 (180,604) (320,131) (178,198)
Proceeds from sales of equity securities, available for sale                 77,640 60,558 41,456
Proceeds from sales of fixed maturities, available for sale                 26,179 86,018 38,379
Net cash provided by (used in) investing activities                 (85,709) (174,311) (83,052)
Cash flows from financing activities:                      
Repayment of debt                 (2,170) (2,136) (8,470)
Preferred stock dividend                 (10) (10) (10)
Common stock dividend                 (24,001) (24,192) (22,287)
Issuance of common stock for stock option exercises                   119 511
Purchase of treasury stock                 (18,141) (8,510) (18,649)
Sale of treasury stock                   2,965  
Purchase of preferred stock                     (256)
Payments related to tax withholding for share-based compensation                 (7,223) (5,451) (12,141)
Excess tax benefits (shortfall) from share-based compensation                   (1,154) 5,310
Net cash provided by (used in) financing activities                 (51,545) (38,369) (54,602)
Net increase (decrease) in cash and cash equivalents                 107,756 (91,284) 81,617
Cash and cash equivalents at beginning of period       105,730       197,014 105,730 197,014 115,397
Cash and cash equivalents at end of period 213,486       105,730       213,486 105,730 197,014
Parent Company [Member]                      
Cash flows from operating activities:                      
Net income                 106,935 99,410 106,484
Adjustments to reconcile net income to net cash provided by (used in) operating activities:                      
Equity in net income of subsidiaries                 (118,781) (121,847) (136,817)
Distribution of income from subsidiaries                 122,156 46,914 58,224
Depreciation                 3 2 4
Amortization of share-based compensation                 10,515 10,288 17,386
Amortization of original issue discount on debt                 10 149 521
Accretion of deferred credit                   (149) (521)
Net realized (gains) losses on investments                 (255) (667) (66)
Deferred income taxes                 1,309 4,724 (693)
Excess tax benefits from share-based compensation                 (5,793) 1,154 (5,310)
Issuance of common stock                 634    
Net change in assets and liabilities relating to operating activities:                      
Income taxes recoverable                 (417) 1,004 255
Income taxes payable                     3,510
Other operating assets and liabilities                 574 (596) (1,338)
Other liabilities and accrued expenses                 778 (2,896)  
Net cash provided by (used in) operating activities                 117,668 37,490 41,639
Cash flows from investing activities:                      
Purchases of equity securities, available for sale                 (4,990) (2,037) (1,442)
Purchase of fixed maturities, available for sale                 (3,000) (3,000)  
Proceeds from sales of equity securities, available for sale                 3,255 2,456 1,481
Proceeds from sales of fixed maturities, available for sale                   3,229  
Net cash provided by (used in) investing activities                 (4,735) 648 39
Cash flows from financing activities:                      
Repayment of debt                     (7,000)
Preferred stock dividend                 (10) (10) (10)
Common stock dividend                 (24,001) (24,192) (22,287)
Issuance of common stock for stock option exercises                   119 511
Purchase of treasury stock                 (18,141) (8,510) (18,649)
Sale of treasury stock                   2,965  
Purchase of preferred stock                     (256)
Payments related to tax withholding for share-based compensation                 (7,223) (5,451) (12,141)
Excess tax benefits (shortfall) from share-based compensation                   (1,154) 5,310
Net cash provided by (used in) financing activities                 (49,375) (36,233) (54,522)
Net increase (decrease) in cash and cash equivalents                 63,558 1,905 (12,844)
Cash and cash equivalents at beginning of period       $ 3,951       $ 2,046 3,951 2,046 14,890
Cash and cash equivalents at end of period $ 67,509       $ 3,951       $ 67,509 $ 3,951 $ 2,046