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Reinsurance - Prepaid Reinsurance Premiums and Reinsurance Recoverable (Payable) and Receivable (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Reinsurance Disclosures [Abstract] |  |  |
Prepaid reinsurance premiums | $ 53,123 | $ 132,806 |
Reinsurance recoverable on unpaid losses and LAE | 72,641 | 182,405 | $ 106
Reinsurance receivable, net | 492 |  |
Reinsurance recoverable (payable) and receivable | $ 73,133 | $ 182,405 |

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- Definition The unexpired portion of premiums ceded on policies in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 340 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507 + Details
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- References No definition available. + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Reinsurance receivable, net. + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all reinsurance recoverable (payable) and receivable. + References No definition available. + Details
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