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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 13,655 | $ 26,882 | $ 33,647 | $ 25,226 | $ 29,152 | $ 30,298 | $ 24,704 | $ 22,330 | $ 99,410 | $ 106,484 | $ 72,988
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Amortization of share-based compensation |  |  |  |  |  |  |  |  | 10,288 | 17,386 | 12,342
Amortization of original issue discount on debt |  |  |  |  |  |  |  |  | 149 | 521 | 840
Accretion of deferred credit |  |  |  |  |  |  |  |  | (149) | (521) | (840)
Net realized (gains) losses on investments |  |  |  |  |  |  |  |  | (2,294) | (1,060) | (5,627)
Deferred income taxes |  |  |  |  |  |  |  |  | 4,724 | (693) | 1,118
Excess tax benefits from share-based compensation |  |  |  |  |  |  |  |  | 1,154 | (5,310) | (7,006)
Net change in assets and liabilities relating to operating activities: |  |  |  |  |  |  |  |  |  |  |
Income taxes recoverable |  |  |  |  |  |  |  |  | 1,004 | 255 | 2,477
Income taxes payable |  |  |  |  |  |  |  |  |  | 3,510 | 6,239
Other liabilities and accrued expenses |  |  |  |  |  |  |  |  | (505) | 625 | 2,774
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 121,396 | 219,271 | 123,346
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchases of equity securities, available for sale |  |  |  |  |  |  |  |  | (66,688) | (65,038) | (116,541)
Purchase of fixed maturities, available for sale |  |  |  |  |  |  |  |  | (320,131) | (178,198) | (106,885)
Proceeds from sales of equity securities, available for sale |  |  |  |  |  |  |  |  | 60,558 | 41,456 | 163,981
Proceeds from sales of fixed maturities, available for sale |  |  |  |  |  |  |  |  | 86,018 | 38,379 | 17,153
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | (174,311) | (83,052) | (77,188)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  | (2,136) | (8,470) | (7,471)
Preferred stock dividend |  |  |  |  |  |  |  |  | (10) | (10) | (13)
Common stock dividend |  |  |  |  |  |  |  |  | (24,192) | (22,287) | (19,240)
Issuance of common stock |  |  |  |  |  |  |  |  | 119 | 511 | 73
Purchase of treasury stock |  |  |  |  |  |  |  |  | (8,510) | (18,649) | (29,736)
Sale of treasury stock |  |  |  |  |  |  |  |  | 2,965 |  |
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 |  |  |  |  |  |  |  |  | (5,451) | (12,141) | (17,655)
Excess tax benefits (shortfall) from share-based compensation |  |  |  |  |  |  |  |  | (1,154) | 5,310 | 7,006
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (38,369) | (54,602) | (48,036)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | (91,284) | 81,617 | (1,878)
Cash and cash equivalents at beginning of period |  |  |  | 197,014 |  |  |  | 115,397 | 197,014 | 115,397 | 117,275
Cash and cash equivalents at end of period | 105,730 |  |  |  | 197,014 |  |  |  | 105,730 | 197,014 | 115,397
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 99,410 | 106,484 | 72,988
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (121,847) | (136,817) | (94,924)
Distribution of income from subsidiaries |  |  |  |  |  |  |  |  | 46,914 | 58,224 | 55,805
Depreciation |  |  |  |  |  |  |  |  | 2 | 4 | 2
Amortization of share-based compensation |  |  |  |  |  |  |  |  | 10,288 | 17,386 | 12,342
Amortization of original issue discount on debt |  |  |  |  |  |  |  |  | 149 | 521 | 840
Accretion of deferred credit |  |  |  |  |  |  |  |  | (149) | (521) | (840)
Net realized (gains) losses on investments |  |  |  |  |  |  |  |  | (667) | (66) | (625)
Deferred income taxes |  |  |  |  |  |  |  |  | 4,724 | (693) | 1,118
Excess tax benefits from share-based compensation |  |  |  |  |  |  |  |  | 1,154 | (5,310) | (7,006)
Net change in assets and liabilities relating to operating activities: |  |  |  |  |  |  |  |  |  |  |
Income taxes recoverable |  |  |  |  |  |  |  |  | 1,004 | 255 | 2,477
Income taxes payable |  |  |  |  |  |  |  |  |  | 3,510 | 6,239
Other operating assets and liabilities |  |  |  |  |  |  |  |  | (596) | (1,338) | 5,752
Other liabilities and accrued expenses |  |  |  |  |  |  |  |  | (2,896) |  |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 37,490 | 41,639 | 54,168
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  |  |  |  |  | (5,585)
Purchases of equity securities, available for sale |  |  |  |  |  |  |  |  | (2,037) | (1,442) | (15,836)
Purchase of fixed maturities, available for sale |  |  |  |  |  |  |  |  | (3,000) |  | (3,000)
Proceeds from sales of equity securities, available for sale |  |  |  |  |  |  |  |  | 2,456 | 1,481 | 26,060
Proceeds from sales of fixed maturities, available for sale |  |  |  |  |  |  |  |  | 3,229 |  | 770
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  | 648 | 39 | 2,409
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  |  |  |  | (7,000) | (6,000)
Preferred stock dividend |  |  |  |  |  |  |  |  | (10) | (10) | (13)
Common stock dividend |  |  |  |  |  |  |  |  | (24,192) | (22,287) | (19,240)
Issuance of common stock |  |  |  |  |  |  |  |  | 119 | 511 | 73
Purchase of treasury stock |  |  |  |  |  |  |  |  | (8,510) | (18,649) | (29,736)
Sale of treasury stock |  |  |  |  |  |  |  |  | 2,965 |  |
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 |  |  |  |  |  |  |  |  | (5,451) | (12,141) | (17,655)
Excess tax benefits (shortfall) from share-based compensation |  |  |  |  |  |  |  |  | (1,154) | 5,310 | 7,006
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (36,233) | (54,522) | (46,565)
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 1,905 | (12,844) | 10,012
Cash and cash equivalents at beginning of period |  |  |  | $ 2,046 |  |  |  | $ 14,890 | 2,046 | 14,890 | 4,878
Cash and cash equivalents at end of period | $ 3,951 |  |  |  | $ 2,046 |  |  |  | $ 3,951 | $ 2,046 | $ 14,890

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow to reacquire preferred stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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- Definition The cash outflow to acquire debt securities classified as available-for-sale securities, because they are not classified as either held-to-maturity securities or trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow to acquire equity securities classified as available-for-sale securities, because they are not classified as trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 + Details
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- Definition Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities. + References No definition available. + Details
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- Definition The cash inflow associated with the sale of debt securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with the sale of equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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