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Reinsurance - Impact of Catastrophe Excess of Loss Reinsurance Treaties and One Quota Share Arrangement on Premiums Written and Earned (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Premiums Written: |  |  |  |
Direct | $ 156,151 | $ 141,280 | $ 238,140 | $ 220,942
Assumed | (841) | (360) | (1,376) | (1,083)
Gross written | 155,310 | 140,920 | 236,764 | 219,859
Ceded | (31,378) | (28,572) | (59,217) | (56,080)
Net premiums written | 123,932 | 112,348 | 177,547 | 163,779
Premiums Earned: |  |  |  |
Direct | 87,196 | 81,761 | 170,802 | 160,281
Assumed | 20,569 | 9,460 | 46,530 | 24,828
Gross earned | 107,765 | 91,221 | 217,332 | 185,109
Ceded | (31,378) | (28,572) | (59,217) | (56,080)
Net premiums earned | $ 76,387 | $ 62,649 | $ 158,115 | $ 129,029

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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 17 -Article 12 + Details
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