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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:                      
Net income $ 29,152 $ 30,298 $ 24,704 $ 22,330 $ 20,972 $ 21,341 $ 17,126 $ 13,549 $ 106,484 [1] $ 72,988 [1] $ 58,977 [1]
Adjustments to reconcile net income to net cash provided by operating activities:                      
Amortization of share-based compensation                 17,386 12,342 6,417
Amortization of original issue discount on debt                 521 840 601
Accretion of deferred credit                 (521) (840) (601)
Net realized (gains) losses on investments                 (1,060) (5,627) 14,740
Net change in unrealized (gains) losses on investments                     (7,850)
Deferred income taxes                 (693) 1,118 7,363
Excess tax benefits from share-based compensation                 (5,310) (7,006) (359)
Other                 42 19 10
Net change in assets and liabilities relating to operating activities:                      
Purchases of equity securities, trading                     (26,009)
Proceeds from sale of equity securities, trading                     102,661
Income taxes recoverable                 255 2,477 (5,558)
Income taxes payable                 3,510 6,239 2,226
Net cash provided by (used in) operating activities                 219,271 123,346 156,959
Cash flows from investing activities:                      
Purchases of equity securities, available for sale                 (65,038) (116,541) (77,859)
Purchases of fixed maturities, available for sale                 (178,198) (106,885) (305,330)
Proceeds from sales of equity securities, available for sale                 41,456 163,981 15,542
Proceeds from sales of fixed maturities, available for sale                 38,379 17,153  
Net cash provided by (used in) investing activities                 (83,052) (77,188) (352,683)
Cash flows from financing activities:                      
Proceeds from borrowings                 1,390   20,000
Repayment of debt                 (8,470) (7,471) (1,471)
Preferred stock dividend                 (10) (13) (29)
Common stock dividend                 (22,287) (19,240) (17,725)
Issuance of common stock                 511 73  
Purchase of treasury stock                 (18,649) (29,736) (32,366)
Purchase of preferred stock                 (256)    
Payments related to tax withholding for share-based compensation                 (12,141) (17,655) (3,161)
Excess tax benefits (shortfall) from share-based compensation                 5,310 7,006 359
Net cash provided by (used in) financing activities                 (54,602) (48,036) (34,393)
Net increase (decrease) in cash and cash equivalents                 81,617 (1,878) (230,117)
Cash and cash equivalents at beginning of period       115,397       117,275 115,397 117,275 347,392
Cash and cash equivalents at end of period 197,014       115,397       197,014 115,397 117,275
Parent Company [Member]                      
Cash flows from operating activities:                      
Net income                 106,484 72,988 58,977
Adjustments to reconcile net income to net cash provided by operating activities:                      
Equity in net income of subsidiaries                 (136,817) (94,924) (78,600)
Distribution of income from subsidiaries                 58,224 55,805 26,898
Depreciation                 4 2  
Amortization of share-based compensation                 17,386 12,342 6,417
Amortization of original issue discount on debt                 521 840 601
Accretion of deferred credit                 (521) (840) (601)
Net realized (gains) losses on investments                 (66) (625) 2,947
Net change in unrealized (gains) losses on investments                     (1,625)
Deferred income taxes                 (693) 1,118 7,363
Excess tax benefits from share-based compensation                 (5,310) (7,006) (359)
Net change in assets and liabilities relating to operating activities:                      
Purchases of equity securities, trading                     (3,972)
Proceeds from sale of equity securities, trading                     16,712
Income taxes recoverable                 255 2,477 (5,558)
Income taxes payable                 3,510 6,239 2,226
Other operating assets and liabilities                 (1,338) 5,752 1,347
Net cash provided by (used in) operating activities                 41,639 54,168 32,773
Cash flows from investing activities:                      
Capital contributions to subsidiaries                   (5,585) (1,600)
Purchases of equity securities, available for sale                 (1,442) (15,836) (10,357)
Purchases of fixed maturities, available for sale                   (3,000) (750)
Proceeds from sales of equity securities, available for sale                 1,481 26,060  
Proceeds from sales of fixed maturities, available for sale                   770  
Net cash provided by (used in) investing activities                 39 2,409 (12,707)
Cash flows from financing activities:                      
Proceeds from borrowings                     20,000
Repayment of debt                 (7,000) (6,000)  
Preferred stock dividend                 (10) (13) (29)
Common stock dividend                 (22,287) (19,240) (17,725)
Issuance of common stock                 511 73  
Purchase of treasury stock                 (18,649) (29,736) (32,365)
Purchase of preferred stock                 (256)    
Proceeds received from issuance of contingently redeemable common stock                   19,000  
Payments related to tax withholding for share-based compensation                 (12,141) (17,655) (3,161)
Excess tax benefits (shortfall) from share-based compensation                 5,310 7,006 359
Net cash provided by (used in) financing activities                 (54,522) (46,565) (32,921)
Net increase (decrease) in cash and cash equivalents                 (12,844) 10,012 (12,855)
Cash and cash equivalents at beginning of period       $ 14,890       $ 4,878 14,890 4,878 17,733
Cash and cash equivalents at end of period $ 2,046       $ 14,890       $ 2,046 $ 14,890 $ 4,878
[1] See “—Note 8 (Stockholders’ Equity)” for an explanation of events subsequent to December 31, 2014 giving rise to pro-forma stockholders’ equity of $218.9 million as of December 31, 2014.