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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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- Definition Amount of cash outflow in the form of ordinary dividends to preferred shareholders of the parent entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=107668666&loc=SL79513924-113897 + Details
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- Definition Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 + Details
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- Definition Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=109223946&loc=SL94080555-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Accretion of deferred credit associated with long term debt. + References No definition available. + Details
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- Definition Equity in net income of subsidiaries. + References No definition available. + Details
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- Definition Excess tax expense benefit from share based compensation financing activities. + References No definition available. + Details
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- Definition Payments To Acquire Equity Securities FV-NI + References No definition available. + Details
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