Heritage Insurance (HRTG) 10-K 15 Mar 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Mar. 01, 2018	Jun. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	HRTG
Entity Registrant Name	HERITAGE INSURANCE HOLDINGS, INC.
Entity Central Index Key	1,598,665
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		26,560,004
Entity Public Float			$ 233,092,426

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Fixed maturity securities, available for sale, at fair value (amortized cost of $552,458 and $576,911 in 2017 and 2016, respectively)	$ 549,796	$ 571,011
Equity securities, available for sale, at fair value (cost of $17,547 and $34,190 in 2017 and 2016, respectively)	17,217	31,971
Total investments	567,013	602,982
Cash and cash equivalents	153,697	105,817
Restricted cash	20,833	20,910
Accrued investment income	5,057	4,764
Premiums receivable, net	67,757	42,720
Reinsurance recoverable on paid and unpaid claims	357,357
Prepaid reinsurance premiums	227,764	106,609
Income taxes receivable	37,338	10,713
Deferred policy acquisition costs, net	41,678	42,779
Property and equipment, net	18,748	17,179
Intangibles, net	101,626	26,542
Goodwill	152,459	46,454
Other assets	19,883	5,775
Total Assets	1,771,210	1,033,244
LIABILITIES AND STOCKHOLDERS' EQUITY
Unpaid losses and loss adjustment expenses	470,083	140,137
Unearned premiums	475,334	318,024
Reinsurance payable	17,577	96,667
Long-term debt, net	184,405	72,905
Deferred income tax	34,333	3,003
Advance premiums	23,648	18,565
Accrued compensation	16,477	4,303
Accounts payable and other liabilities	169,537	21,681
Total Liabilities	1,391,394	675,285
Commitments and contingencies (Note 14)
Stockholders’ Equity:
Common stock, $0.0001 par value, 50,000,000 shares authorized, 26,560,004 shares issued and 25,885,004 outstanding at December 31, 2017 and 29,740,441 shares issued and 28,840,443 outstanding at December 31, 2016	3	3
Additional paid-in capital	294,836	205,727
Accumulated other comprehensive loss	(3,064)	(5,018)
Treasury stock, at cost, 7,099,597 shares at December 31, 2017 and 1,759,330 shares at December 31, 2016	(87,185)	(25,562)
Retained earnings	175,226	182,809
Total Stockholders' Equity	379,816	357,959
Total Liabilities and Stockholders' Equity	$ 1,771,210	$ 1,033,244

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement Of Financial Position [Abstract]
Fixed maturities available for sale, at amortized cost	$ 552,458	$ 576,911
Equity securities, cost	$ 17,547	$ 34,190
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	26,560,004	29,740,441
Common stock, shares outstanding	25,885,004	28,840,443
Treasury stock, shares	7,099,597	1,759,330

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
REVENUES:
Gross premiums written	$ 625,565	$ 626,704	$ 586,098
Change in gross unearned premiums	17,739	13,814	(61,358)
Gross premiums earned	643,304	640,518	524,740
Ceded premiums	(263,740)	(228,797)	(148,472)
Net premiums earned	379,564	411,721	376,268
Net investment income	11,332	9,181	7,421
Net realized gains	564	1,733	1,508
Other revenue	15,163	16,323	9,595
Total revenues	406,623	438,958	394,792
EXPENSES:
Losses and loss adjustment expenses	201,482	238,862	141,191
Policy acquisition costs	83,892	84,421	57,186
General and administrative expenses	71,714	58,910	46,125
Total expenses	357,088	382,193	244,502
Operating income	49,535	56,765	150,290
Interest expense, net	13,210	362
Other non-operating expense, net	42,217
(Loss) income before income taxes	(5,892)	56,403	150,290
(Benefit) provision for income taxes	(4,773)	22,538	57,778
Net (loss) income	(1,119)	33,865	92,512
OTHER COMPREHENSIVE INCOME
Change in net unrealized gains (losses) on investments	5,688	(3,120)	(4,606)
Reclassification adjustment for net realized investment gains	(564)	(1,733)	(1,508)
Income tax (expense) benefit related to items of other comprehensive income	(3,170)	1,868	2,358
Total comprehensive income	$ 835	$ 30,880	$ 88,756
Weighted average shares outstanding
Basic	26,798,465	29,632,171	30,056,491
Diluted	26,798,465	29,634,349	30,326,468
(Loss) earnings per share
Basic	$ (0.04)	$ 1.14	$ 3.08
Diluted	$ (0.04)	$ 1.14	$ 3.05

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	B R C Restoration Specialists Inc	Common Stock [Member]	Common Stock [Member]B R C Restoration Specialists Inc	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member]B R C Restoration Specialists Inc	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2014	$ 255,089		$ 3		$ 188,342		$ 65,021		$ 1,723
Beginning Balance, Shares at Dec. 31, 2014			29,794,960
Net unrealized change in investments, net of tax	(3,756)								(3,756)
Stock issued in connection with acquisition		$ 2,000				$ 2,000
Stock issued in connection with acquisition, Shares			79,850	79,850
Exercise of stock options and warrants	8,900				8,900
Exercise of stock options and warrants, Shares			566,600
Stock-based compensation	2,647				2,647
Dividends declared on common stock	(1,578)						(1,578)
Excess tax (expense) benefit on stock-based compensation	$ 739				739
Exercise of stock options, Shares	536,000
Net (loss) income	$ 92,512						92,512
Ending balance at Dec. 31, 2015	356,553		$ 3		202,628		155,955		(2,033)
Ending balance, Shares at Dec. 31, 2015			30,441,410
Net unrealized change in investments, net of tax	(2,985)								(2,985)
Stock buy-back	$ (25,562)							$ (25,562)
Stock buy-back, Shares	(1,759,330)		(1,759,330)
Shares tendered for income tax withholding	$ (977)				(977)
Shares tendered for income tax withholding, Shares			(66,637)
Stock-based compensation on vested restricted stock	4,815				4,815
Stock-based compensation on vested restricted stock, Shares			225,000
Dividends declared on common stock	(7,011)						(7,011)
Excess tax (expense) benefit on stock-based compensation	(739)				(739)
Net (loss) income	33,865						33,865
Ending balance at Dec. 31, 2016	357,959		$ 3		205,727		182,809	(25,562)	(5,018)
Ending balance, Shares at Dec. 31, 2016			28,840,443
Net unrealized change in investments, net of tax	1,954								1,954
Stock buy-back	(61,623)							(61,623)
Stock buy-back, Shares			(5,340,267)
Shares tendered for income tax withholding	(1,599)				(1,599)
Shares tendered for income tax withholding, Shares			(87,067)
Stock-based compensation on vested restricted stock	4,815				4,815
Stock-based compensation on vested restricted stock, Shares			225,000
Stock issued in connection with acquisition	40,000				40,000
Stock issued in connection with acquisition, Shares			2,222,215
Reclassification of derivative liability to equity	51,641				51,641
Deferred tax on convertible debt	(6,165)				(6,165)
Dividends declared on common stock	(6,464)						(6,464)
Exercise of stock options	$ 417				417
Exercise of stock options, Shares	24,680		24,680
Net (loss) income	$ (1,119)						(1,119)
Ending balance at Dec. 31, 2017	$ 379,816		$ 3		$ 294,836		$ 175,226	$ (87,185)	$ (3,064)
Ending balance, Shares at Dec. 31, 2017			25,885,004

Consolidated Statements of Cha6

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2015
Common Stock [Member]
Stock issued in connection with acquisition, Shares	2,222,215	79,850

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING ACTIVITIES
Net (loss) income	$ (1,119)	$ 33,865	$ 92,512
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Stock-based compensation	4,815	4,815	2,647
Bond amortization and accretion	8,810	8,016	6,246
Amortization of original issuance discount on debt	2,314
Depreciation and amortization	7,742	8,976	1,350
Bad debt recovery			(250)
Net realized gains	(564)	(1,733)	(1,508)
Change in fair value of option feature	41,013
Net loss on repurchase of debt	1,203
Deferred income taxes, net of acquired	19,619	3,103	1,016
Changes in operating assets and liabilities:
Accrued investment income	303	(1,355)	(792)
Premiums receivable, net	(910)	(10,754)	(10,287)
Restricted cash	77	(7,825)	(8,746)
Prepaid reinsurance premiums	16,223	(23,300)	(35,369)
Reinsurance premiums receivable and recoverable	(284,284)
Income taxes receivable	(28,598)	(10,713)
Deferred policy acquisition costs, net	1,101	(7,979)	(10,430)
Other assets	(4,907)	177	(2,594)
Unpaid losses and loss adjustment expenses	236,142	56,415	32,253
Unearned premiums	(17,740)	(13,814)	61,358
Reinsurance payable	(79,106)	36,457	43,097
Accrued interest	3,217
Income taxes payable		(2,092)	(10,716)
Accrued compensation	3,355	779	1,863
Advance premiums	3,155	4,336	6,995
Other liabilities	75,703	(2,244)	(15,524)
Net cash provided by operating activities	7,566	67,122	146,881
INVESTING ACTIVITIES
Proceeds from sales and maturities of investments available for sale	349,906	180,190	151,307
Purchases of investments available for sale	(215,844)	(317,666)	(237,946)
Proceeds from sale of investment in mortgage loan			6,849
Acquisition of a business, net of cash acquired	(140,919)	(110,319)	(6,000)
Cost of property and equipment acquired	(385)	(1,621)	(1,174)
Net cash used in investing activities	(7,242)	(249,416)	(86,964)
FINANCING ACTIVITIES
Proceeds from convertible notes	136,750	77,910
Repurchase of convertible notes	(25,189)
Debt acquisition costs	(5,609)
Proceeds from mortgage loan	12,658
Proceeds from exercise of stock options	417		8,900
Excess tax expense on stock-based compensation		(739)	739
Shares tendered for income tax withholding	(1,599)	(977)
Purchase of treasury stock	(61,623)	(25,562)
Dividends	(8,249)	(6,806)
Net cash provided by financing activities	47,556	43,826	9,639
Increase (decrease) in cash and cash equivalents	47,880	(130,460)	75,796
Cash and cash equivalents, beginning of period	105,817	236,277	160,481
Cash and cash equivalents, end of period	153,697	105,817	236,277
Supplemental Cash Flows Information:
Income taxes paid, net	4,500	$ 31,912	68,824
Interest paid	4,054
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Original issue discount on convertible notes	16,838
Issuance of shares for consideration in the acquisition of a business	$ 40,000		$ 2,000

Basis of Presentation, Nature o

Basis of Presentation, Nature of Business and Significant Accounting Policies and Practices	12 Months Ended
	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation, Nature of Business and Significant Accounting Policies and Practices	Note 1. Basis of Presentation, Nature of Business and Significant Accounting Policies and Practices Business Description Heritage Insurance Holdings, Inc. (the “Company”, “we”, “our”, “us”) was initially formed as a Florida limited liability company in 2012. On January 1, 2014, the Company formed a Delaware limited liability company, also named Heritage Insurance Holdings, LLC and merged with it in order to domicile the Company in Delaware. Effective May 22, 2014, Heritage Insurance Holdings, LLC converted into a Delaware corporation named Heritage Insurance Holdings, Inc. As used in these consolidated financial statements, the terms “the Company”, “we”, “our” and “us” also refer to Heritage Insurance Holdings, LLC and its consolidated subsidiaries prior to our conversion to a Delaware corporation. Our insurance subsidiaries are Heritage Property & Casualty Insurance Company (“Heritage P&C”), Zephyr Insurance Company (“Zephyr”), Narragansett Bay Insurance Company (“NBIC”) and Pawtucket Insurance Company (“PIC”). Our other subsidiaries include: Heritage MGA, LLC (“MGA”), the managing general agent that manages substantially all aspects of our insurance subsidiaries’ business; Contractors’ Alliance Network, LLC, our vendor network manager, which includes BRC Restoration Specialists, Inc., our restoration service; Skye Lane Properties, LLC, our property management subsidiary; First Access Insurance Group, LLC, our retail agency; Osprey Re Ltd, our reinsurance subsidiary that may provide a portion of the reinsurance protection purchased by our insurance subsidiaries; Heritage Insurance Claims, LLC, an inactive subsidiary reserved for future development; Zephyr Acquisition Company (“ZAC”); NBIC Holdings, Inc., NBIC Service Company which provides services to NBIC and Westwind Underwriters, Inc., an inactive subsidiary of NBIC Holdings, Inc. Our primary products are personal and commercial residential insurance, which we currently offer in Alabama, Connecticut, Florida, Georgia, Hawaii, Massachusetts, New Jersey, New York, North Carolina, Rhode Island and South Carolina. We conduct our operations under a single reporting segment. Basis of Presentation The consolidated financial statements include the accounts of Heritage Insurance Holdings, Inc. and its wholly-owned subsidiaries. The accompanying consolidated financial statements include the accounts of the Company and all other entities in which the Company has a controlling financial interest (none of which are variable interest entities). All intercompany accounts and transactions have been eliminated in consolidation. The Company qualifies as an “emerging growth company” as defined in Section 2(a)(19) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). As a result, the Company is eligible for certain exemptions from various reporting requirements applicable to other public companies that are not emerging growth companies. The Company intends to continue to take advantage of some, but not all, of the exemptions available to emerging growth companies until such time that it is no longer an emerging growth company. The Company has, however, irrevocably elected not to take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards. As a result, the Company will comply with new or revised accounting standards on the relevant dates on which adoption of such standards is required for non-emerging growth companies. Use of Estimates The preparation of consolidated financial statements in conformity with United States Generally Accepted Accounting Principles (“U.S. GAAP”) requires us to make estimates and assumptions about future events that affect the amounts reported in our consolidated financial statements and accompanying notes. We evaluate our estimates on an ongoing basis when updated information related to such estimates becomes available. We base our estimates on historical experience and information available to us at the time these estimates are made. Actual results could differ materially from these estimates. Cash and Cash Equivalents The Company’s cash and cash equivalents include demand deposits with financial institutions and short-term, highly-liquid financial instruments with original maturities of three months or less when purchased. The carrying amounts reported in the consolidated balance sheets for interest bearing deposits approximate their fair value because of the short maturity of these financial instruments. Restricted Cash As of December 31, 2017 and 2016, restricted cash was $20.8 million and $20.9 million, respectively. Heritage P&C holds approximately $18.3 million relating to a reinsurance agreement with an entity that issued catastrophe (“CAT”) bonds, as Heritage P&C is contractually required to deposit certain installments of reinsurance premiums into a trust account. Investments The Company classifies all of its investments in fixed maturity securities and equity securities as available-for-sale, and reports them at fair value. Subsequent to its acquisition of available-for-sale securities, the Company records changes in value through the date of disposition as unrealized holding gains and losses, net of tax effects, and includes them as a component of other comprehensive income. The Company includes realized gains and losses, which it calculates using the specific-identification method for determining the cost of securities sold, in net income. The Company amortizes any premium or discount on fixed maturities over the remaining maturity period of the related securities using the effective interest method, and reports the amortization in net investment income. The Company recognizes dividends and interest income when earned. Quarterly, the Company performs an assessment of its investments to determine if any are “other-than-temporarily” impaired. An investment is impaired when the fair value of the investment declines to an amount less than the cost or amortized cost of that investment. As part of the assessment process, the Company determines whether the impairment is temporary or “other-than-temporary”. The Company bases its assessment on both quantitative criteria and qualitative information, considering a number of factors including, but not limited to: how long the security has been impaired; the amount of the impairment; whether, in the case of equity securities, the Company intends to hold, and have the ability to hold, the security for a period sufficient for us to recover our cost basis, or whether, in the case of debt securities and participations in mortgage loans, the Company intends to sell the investment or it is more likely than not that the Company will have to sell the investment before it recovers the amortized cost or cost; the financial condition and near-term prospects of the issuer; whether the issuer is current on contractually-obligated interest and principal payments; key corporate events pertaining to the issuer and whether the market decline was affected by macroeconomic conditions. If the Company were to determine that an equity security has incurred an “other-than-temporary” impairment, the Company would permanently reduce the cost of the security to fair value and recognize an impairment charge in its consolidated statements of operations and comprehensive income. If a debt security or participation in a commercial mortgage loan was impaired and the Company either intends to sell the investment or it is more likely than not that the Company will have to sell the investment before it is able to recover the amortized cost or cost, then the Company would record the full amount of the impairment in its consolidated statement of operations and other comprehensive income. A large portion of the Company’s investment portfolio consists of fixed maturity securities, which may be adversely affected by changes in interest rates as a result of governmental monetary policies, domestic and international economic and political conditions and other factors beyond its control. A rise in interest rates would decrease the net unrealized holding gains of our investment portfolio, offset by the Company’s ability to earn higher rates of return on funds reinvested. Conversely, a decline in interest rates would increase the net unrealized holding gains of our investment portfolio, offset by lower rates of return on funds reinvested. Accumulated other comprehensive income consists solely of unrealized gains and loss investments and is presented net of income tax. Fair Value Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants (an exit price). When reporting the fair values of the Company’s financial instruments, the Company prioritizes those fair value measurements into one of three levels based on the nature of the inputs, as follows: • Level 1—Assets and liabilities with values based on unadjusted quoted prices for identical assets or liabilities in an active market that the Company is able to access; • Level 2—Asset and liabilities with values based on quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets in markets that are not active; or valuation models with inputs that are observable, directly or indirectly for substantially the term of the asset or liability. • Level 3—certain inputs are unobservable (supported by little or no market activity) and significant to the fair value measurement. Unobservable inputs reflect the Company’s best estimate of what hypothetical market participants would use to determine a transaction price for the asset or liability at the reporting date based on the best information available in the circumstances. The Company estimates the fair value of its investments using the closing prices on the last business day of the reporting period, obtained from active markets such as the NYSE and NASDAQ. For securities for which quoted prices in active markets are unavailable, the Company uses observable inputs such as quoted prices in inactive markets, quoted prices in active markets for similar instruments, benchmark interest rates, broker quotes and other relevant inputs. The Company does not have any investments in its portfolio which require the use of unobservable inputs. The Company’s estimate of fair value reflects the interest rate environment that existed as of the close of business on December 31, 2017. Changes in interest rates after December 31, 2017 may affect the fair value of the Company’s investments. The Company believes the carrying amounts of its cash and cash equivalents, accounts receivable, accounts payable, accrued expenses, and other current liabilities approximate their fair values at December 31, 2017 and 2016, due to the immediate or short-term maturity of these instruments. The Company’s non-financial assets, such as goodwill and property, plant and equipment are carried at cost until there are indicators of impairment, and are recorded at fair value only when an impairment charge is recognized. Long term debt is recorded at carrying value, see Note 11 – Long-Term Debt Premiums The Company records direct and assumed premiums written as revenue, net of ceded amounts, on a daily pro rata basis over the contract period of the related policies that are in force. For any portion of premiums not earned at the end of the reporting period, the Company records an unearned premium liability. In a one-time only transaction on September 1, 2017, the Company took over approximately 19,000 policies representing approximately $30.0 million in annualized premiums from Sawgrass Mutual Insurance Company. Premiums receivable represents amounts due from our policyholders for billed premiums and related policy fees. We perform a policy-level evaluation to determine the extent to which the balance of premiums receivable exceeds the balance of unearned premiums. We then age any resulting exposure based on the last date the policy was billed to the policyholder, and we establish an allowance for credit losses for any amounts outstanding for more than 90 days. When we receive payments on amounts previously charged off, we reduce bad debt expense in the period we receive the payment. Balances in premiums receivable and the associated allowance account are removed upon cancellation of the policy due to non-payment. We recorded no allowance for the years ended December 31, 2017 and 2016, respectively. Bad debt expense (recovery) related to uncollectible premiums was $0, $250,000 and $(250,000) for the years ended December 31, 2017, 2016 and 2015, respectively. When the Company receives premium payments from policyholders prior to the effective date of the related policy, the Company records an advance premiums liability. On the policy effective date, the Company reduces the advance premium liability and records the premiums as described above. Policy Acquisition Costs The Company incurs policy acquisition costs that vary with, and are directly related to, the production of new business. Policy acquisition costs consist of the following four items: (i) commissions paid to outside agents at the time of policy issuance; (ii) policy administration fees paid to a third-party administrator at the time of policy issuance; (iii) premium taxes; and (iv) inspection fees. The Company capitalizes policy acquisition costs to the extent recoverable, then the Company amortizes those costs over the contract period of the related policy. At each reporting date, the Company determines whether it has a premium deficiency. A premium deficiency would result if the sum of the Company’s expected losses, deferred policy acquisition costs, and policy maintenance costs (such as costs to store records and costs incurred to collect premiums and pay commissions) exceeded the Company’s related unearned premiums plus investment income. Should the Company determine that a premium deficiency exists, the Company would write off the unrecoverable portion of deferred policy acquisition cost. NBIC earns ceding commission on its gross and net quota share reinsurance contracts. Our policy is to offset policy acquisition costs reported on the consolidated statement of operations and comprehensive income by ceding commission income. Ceding commission income is deferred and recognized over the quota share contract period. The amount and rate of ceding reinsurance commissions earned on the net quota share contract can slide within a prescribed minimum and maximum, depending on loss performance and how future losses develop. Long-Lived Assets—Property and Equipment Property and equipment is stated at cost less accumulated depreciation and amortization. Depreciation is calculated on a straight-line basis over the estimated useful lives as follows: building—40 years; computer hardware and software 3—years; office and furniture equipment—3 to 7 years. Leasehold improvements are amortized over the shorter of the lease term or the asset’s useful life. Expenditures for improvements are capitalized to the property accounts. Replacements and maintenance and repairs that do not improve or extend the life of the respective assets are expensed as incurred. Business Acquisition The application of the purchase method of accounting for business combinations requires the use of significant estimates and assumptions in determining the fair value of assets acquired and liabilities assumed in order to properly allocate the fair value of the acquired business. The estimates of the fair value of the assets acquired and liabilities assumed are based upon assumptions believed to be reasonable using established valuation techniques that consider a number of factors and when appropriate, valuations performed by independent third-party appraisers. Assets acquired and liabilities assumed in connection with business combinations are recorded based on their respective fair values at the date of acquisition. Goodwill and Intangible Assets Goodwill represents the excess of costs over the fair value of net assets acquired. Goodwill is subject to evaluation for impairment using a fair value based test. This evaluation is performed annually, during the fourth quarter or more frequently if facts and circumstances warrant. The Company uses a qualitative approach to test goodwill for impairment by first assessing qualitative factors to determine whether it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. The Company applies this qualitative approach as of October 1 annually to any and all reporting units. If required following the qualitative assessment, the first step in the goodwill impairment test involves comparing the fair value of each of a reporting unit to the carrying value of a reporting unit. If the carrying value of a reporting unit exceeds the fair value of the reporting unit, the Company is required to proceed to the second step. In the second step, the fair value of the reporting unit would be allocated to the assets (including unrecognized intangibles) and liabilities of the reporting unit, with any residual representing the implied fair value of goodwill. An impairment loss would be recognized if, and to the extent that, the carrying value of goodwill exceeded the implied value. The Company reviews amortizable intangible assets for impairment whenever events or circumstances indicate that carrying amounts may not be recoverable. If the Company concludes that impairment exists, the carrying amount is reduced to fair value. Impairment of Long-Lived Assets Including Intangible Assets Subject to Amortization The Company assesses the recoverability of long-lived assets when events or circumstances indicate that the assets might have become impaired. The Company determines whether the assets can be recovered from undiscounted future cash flows and, if not recoverable, the Company recognizes impairment to reduce the carrying value to fair value. Recoverability of long lived assets is dependent upon, among other things, the Company’s ability to maintain profitability, so as to be able to meet its obligations when they become due. No impairment was recognized in any period presented. Unpaid Losses and Loss Adjustment Expenses The Company’s reserves for unpaid losses and loss adjustment expenses represent the estimated ultimate cost of settling all reported claims plus all claims we incurred related to insured events that have occurred as of the reporting date, but that policyholders have not yet reported to the Company (incurred but not reported, or “IBNR”). The Company estimates its reserves for unpaid losses and loss adjustment expenses using individual case-based estimates for reported claims and actuarial estimates for IBNR losses. The Company continually reviews and adjusts its estimated losses as necessary based on industry development trends, the Company’s evolving claims experience and new information obtained. If the Company’s unpaid losses and loss adjustment expenses are considered to be deficient or redundant, the Company increases or decreases the liability in the period in which it identifies the difference and reflects the change in its current period results of operations. Though the Company’s estimate of the ultimate cost of settling all reported and unreported claims may change at any point in the future, a reasonable possibility exists that its estimate may vary significantly in the near term from the estimated amounts included in the Company’s consolidated financial statements. The Company reports its reserves for unpaid losses and loss adjustment expenses gross of the amounts related to unpaid losses recoverable from reinsurers and reports losses net of amounts ceded to reinsurers. The Company does not discount its loss reserves for financial statement purposes. The Company remains liable for claims payments if any reinsurer is unable to meet its obligations under the reinsurance agreements. Failure of reinsurers to honor their obligations could result in losses to the Company. The Company evaluates the financial condition of its reinsurers and monitors concentration of credit risk arising from similar geographic regions, activities or economics characteristics of the reinsurers to minimize its exposure to significant loses from reinsurers insolvencies. The Company contracts with several reinsurers to secure its annual reinsurance coverage, which the excess of loss treaties generally becomes effective June 1st each year. The Company purchases reinsurance each year taking into consideration probable maximum losses and reinsurance market condition. Other revenue Our insurance affiliates may charge policyholders a policy fee on each policy written; these fees are not subject to refund, and the Company recognizes the income immediately when collected. The Company also charges pay-plan fees to policyholders that pay its premiums in more than one installment and records the fees as income when collected. Other income includes rental income due under non-cancelable leases for space at the Company’s commercial property. Reinsurance The Company follows industry practice of reinsuring a portion of our risks. Reinsurance involves transferring, or “ceding”, all or a portion of the risk exposure on policies the Company writes to another insurer, known as a reinsurer. To the extent that the Company’s reinsurers are unable to meet the obligations they assume under the Company’s reinsurance agreements, the Company remains liable for the entire insured loss. The Company’s reinsurance agreements are generally short-term, prospective contracts. The Company records an asset, prepaid reinsurance premiums, and a liability, reinsurance payable, for the entire contract amount upon commencement of new reinsurance agreements. The Company amortizes its prepaid reinsurance premiums over the 12-month contract period. When the Company incurs losses recoverable under its reinsurance program, the Company records amounts recoverable from its reinsurers on paid losses plus an estimate of amounts recoverable on unpaid losses. The estimate of amounts recoverable on unpaid losses is a function of the Company’s liability for unpaid losses associated with the reinsured policies; therefore, the amount changes in conjunction with any changes to the estimate of unpaid losses. Given that an estimate of amounts recoverable from reinsurers on unpaid losses may change at any point in the future because of its relation to the Company’s reserves for unpaid losses, a reasonable possibility exists that an estimated recovery may change significantly from initial estimates. The Company estimates uncollectible amounts receivable from reinsurers based on an assessment of factors including the creditworthiness of the reinsurers and the adequacy of collateral obtained, where applicable. The Company recorded no uncollectible amounts under its reinsurance program or bad debt expense related to reinsurance for the years ended December 31, 2017, 2016 and 2015. Assessment Guaranty fund and other insurance-related assessments imposed upon the Company’s insurance company affiliates are recorded as policy acquisition costs in the period the regulatory agency imposes the assessment. To recover guaranty or other insurance-related assessments, the Company in turn submits a plan for recoupment to the Insurance Commissioner for approval and upon approval, begins collecting a policy surcharge that will allow it to collect the prior years assessments. There were no assessments during the periods presented. The Company collects other assessments imposed upon policyholders as a policy surcharge and records the amounts collected as a liability until the Company remits the amounts to the regulatory agency that imposed the assessment. Long-Term Debt A long-term debt instrument with embedded features such as conversion and redemption options is evaluated to determine whether bifurcation and derivative accounting is applicable. If such instrument is not subject to derivative accounting, it is further evaluated to determine if the Company is required to separately account for the liability and equity components. To determine the carrying values of the debt and derivative components at issuance, the Company measures the fair value of a similar liability, including any embedded features other than the conversion option, and assigns such value to the liability or equity component. The liability component’s fair value is then subtracted from the initial proceeds to determine the carrying value of the debt instrument’s derivative component. The conversion option liability is revalued each quarter. Any gain or loss is recorded as a non-operating expense on the Consolidated Statements of Operations and Comprehensive Income. On December 1, 2017, the derivative liability initially recognized in August 2017 was reevaluated and reclassified to equity. see Note 11 . Long-Term Debt Debt Issuance and Discount Costs In connection with the issuance of the Secured Notes and Convertible debt, the debt issuance and discount costs are reflected on the balance sheet as an offset to long-term debt, and amortized using the effective interest method over the life of the underlying debt instrument. Stock-Based Compensation The Company measures stock-based compensation at the grant date based on the fair value of the award and recognizes stock-based compensation expense over the requisite vesting period. Determining the fair value of stock option awards requires judgment, including estimating stock price volatility, forfeiture rates and expected option life. Restricted stock awards are valued based on the fair value of the stock on the grant date and the related compensation expense is recognized over the vesting period. Earnings Per Share The Company reports both basic earnings per share and diluted earnings per share. To calculate basic earnings per share, the Company divides net income attributable to common shareholders by the weighted-average number of shares outstanding during the period, including vested restricted shares. The Company calculates diluted earnings per share by dividing net income attributable to common shareholders by the weighted-average number of shares, and the effect of share equivalents, vested and unvested restricted shares and convertible notes outstanding during the period using the treasury stock method to calculate common stock equivalents. Income tax Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which we expect to recover or settle those temporary differences. The effect on deferred taxes and liabilities attributable to a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are recognized to the extent that there is sufficient positive evidence, as allowed under the Accounting Standard Codification Topic 740 ("ASC 740"), Income Taxes, to support the recoverability of those deferred tax assets. The Company establishes a valuation allowance to the extent that there is insufficient evidence to support the recoverability of the deferred tax asset under ASC 740. In making such a determination, management considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies, and results of recent operations. If it is determined that the deferred tax assets would be realizable in the future in excess of their net recorded amount, an adjustment would be made to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. We recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more likely than not threshold, the amount recognized in the consolidated financial statements is the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant taxing authority. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act of 2017 (the “Tax Act”), which makes broad and complex changes to the U.S. Tax code. One of the provisions of the Tax Act reduced the corporate federal income tax rate from 35% to 21% effective January 1, 2018. Pursuant to current accounting guidance, all deferred tax assets and liabilities were re-measured to recognize the tax rate that is expected to apply when the tax effects are ultimately recognized in future periods upon the date of enactment. Concentrations of Risk The Company’s current operations subject us to the following concentrations of risk: • Revenue—The Company writes residential property and liability policies exclusively. • Geographic—The Company writes its premium in coastal states in the southeastern and northeastern United States and Hawaii, with over 95% of the premium written in Florida, Massachusetts, New Jersey, New York, and Hawaii. • Group concentration of credit risk—All of the Company’s reinsurers engage in similar activities and have similar economic characteristics that could cause their ability to repay us to be similarly affected by changes in economic or other conditions. • Credit risk—The Company chooses to deposit all its cash at twelve financial institutions. The Company mitigates its geographic and group concentrations of risk by entering into reinsurance contracts with highly rated, financially-stable reinsurers, and by securing irrevocable letters of credit from reinsurers when necessary. With regard to cash, the Company had $138.4 million and $123.4 million in excess of Federal Deposit Insurance Corporation (“FDIC”) insurance limits at December 31, 2017 and 2016, respectively. Deposits held in non- interest-bearing transaction accounts are combined with interest-bearing accounts and are insured up to $250,000. Reclassification Certain amounts in the consolidated financial statements for the period from December 31, 2016 have been reclassified to conform to the classification used to prepare the consolidated financial statements for the year ended December 31, 2017. These reclassifications had no material impact on the Company’s consolidated financial position, results of operations or cash flows as previously reported. Accounting Pronouncements The Company describes below recent pronouncements that may have a significant effect on its consolidated financial statements or on its disclosures upon future adoption. The Company does not discuss recent pronouncements that are not anticipated to have an impact on, or are unrelated to, its financial condition, results of operations, or related disclosures. In March 2018, the FASB issued ASU 2018-04, Investments-Debt Securities (Topic 320) and Regulated Operations (Topic 980). Investments-Debt Securities Regulated Operations The Company does not anticipate the adoption of ASU 2018-04 will have a material impact on its consolidated financial statements. In February 2018, the FASB issued ASU 2018-03, Recognition and Measurement of Financial Assets and Financial Liabilities, In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220) In May 2017, the FASB issued ASU No. 2017-09, Compensation–Stock Compensation (Topic 718): Scope of Modification Accounting In March 2017, the FASB issued ASU No 2017-08, Receivables – Nonrefundable Fees and Other Costs 310-20 In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805). Clarifying the Definition of a Business, In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), which requires entities to include in their cash and cash-equivalent balances in the statement of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents. The ASU does not defi

Business Acquisitions

Business Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Business Acquisitions	Note 2. Business Acquisitions Acquisition of NBIC On November 30, 2017, the Company completed the acquisition of all the outstanding capital stock of NBIC Holdings, Inc., the parent company of Narragansett Bay Insurance Company, a leading specialty underwriter of personal residential insurance products and services in several states in the northeastern United States. The acquisition resulted in NBIC becoming a wholly-owned subsidiary of the Company (the “Acquisition”). The Company completed the NBIC Acquisition pursuant to the previously disclosed Agreement and Plan of Merger, dated as of August 8, 2017, by and among the Company, Gator Acquisition Merger Sub, Inc., NBIC and PBRA, LLC, in its capacity as Stockholder Representative (the “Merger Agreement”). The completion of the NBIC acquisition represents a significant advancement in executing our geographic diversification strategy by leveraging our combined platform to accelerate growth along the Eastern region. The purchase price for the Acquisition was $250 million, including $210 million in cash, plus 2,222,215 shares of the Company’s common stock (Stock Consideration”) with an aggregate value of $40 million, subject to a post-closing book value adjustment. The Stock Consideration was issued at closing in an exempt private placement pursuant to Section 4(a)(2) of the Securities Act of 1933, as amended. On February 12, 2018, the Company received notice of effectiveness from the Securities and Exchange Commission (“SEC”) on its Form S-3 registering the resale of the common stock initially filed on December 2, 2017. In accordance with the Merger Agreement, 687,802 shares from the Stock Consideration were placed into an escrow account to secure any amounts payable pursuant to the post-closing book value adjustment provisions. The transaction was accounted for using the acquisition method of accounting, which requires, assets acquired and liabilities assumed be recognized at their fair values as of the acquisition date. Goodwill is not deductible for tax purposes, but is subject to annual impairment tests using a fair-value based approach. The table below presents the Company’s the fair values of NBIC’s tangible and intangible assets acquired and liabilities assumed. The operations of NBIC are included in our audited consolidated statement of operations and comprehensive income effective November 30, 2017. The following table summarizes the allocation of the purchase price as of the balance sheet date: Purchase Consideration Cash and stock, net of cash acquired $ 180,919 Assets acquired Investments $ 101,215 Premiums and agent's receivable 24,127 Other assets 13,173 Prepaid reinsurance premiums 137,378 Reinsurance recoverable on paid and unpaid claims 73,073 Intangible assets 81,240 Total assets acquired $ 430,206 Liabilities assumed Unpaid losses and loss adjustment expenses 93,804 Unearned premiums 175,050 Reinsurance payable 16 Deferred revenue 57,809 Accounts payable 12,913 Other liabilities assumed 15,701 Total liabilities assumed $ 355,293 Net assets acquired $ 74,914 Goodwill (1) 106,005 Total purchase price, net of cash acquired $ 180,919 1. Goodwill largely consists of expected synergies and economies of scale resulting from the business combination Unaudited Pro Forma Financial Information The following unaudited pro forma results of operations assume that the NBIC acquisition occurred at the beginning of the periods presented. The pro forma amounts include certain adjustments, including depreciation and amortization expense and income taxes. The pro forma amounts for the twelve month period below exclude acquisition-related charges. Accordingly, these unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what have been if the acquisitions had occurred as of January 1, 2016, nor are they indicative of future results of operations. Year Ended December 31, 2017 2016 (in thousands, except per share) Revenue $ 456,560 $ 511,663 Net income $ 13,844 $ 42,397 Basic, earnings per share $ 0.48 $ 1.33 Diluted, earnings per share $ 0.47 $ 1.33 The following table summarizes the results of the acquired NBIC operations since the acquisition date that have been included within our consolidated statement of operations. November 30, 2017 to December 31, 2017 (in thousands) Total revenue $ 5,475 Net income $ 9,121 Net income includes a tax benefit of $2.2 million due to the application of the Tax Act. Acquisition of ZAC On March 21, 2016, the Company acquired 100% of the outstanding stock of ZAC and its wholly-owned subsidiary, Zephyr, in exchange for approximately $110.3 million, net of cash acquired. Zephyr is a specialty property insurance provider that offers policies for residential customers in Hawaii that only cover the peril of windstorm-hurricane events. The purchase consideration for this acquisition has been allocated to the estimated fair market value of the net assets acquired, including approximately $76.5 million in investments, $31.8 million in identifiable intangibles assets and a residual amount of goodwill of approximately $38.4 million offsets by $43.2 million in assumed liabilities. This acquisition furthers the Company’s strategic push to diversify business operations and achieve potential reinsurance synergies while expanding growth opportunities outside of Florida. Pro Forma Information The following table presents selected pro forma information, assuming the acquisition of ZAC had occurred on January 1, 2016. The unaudited pro forma information is not necessarily indicative of the results that the Company would have achieved had the transaction taken place on January 1, 2016 and the unaudited pro forma information does not purport to be indicative of future financial results. Year Ended December 31, 2016 2015 (in thousands, except per share) Revenue $ 447,780 $ 432,070 Net income $ 36,817 $ 104,722 Basic, earnings per share $ 1.24 $ 3.48 Diluted, earnings per share $ 1.24 $ 3.45 Acquisition of BRC Restoration Specialists, Inc. On July 31, 2015, the Company acquired BRC Restoration Specialists, Inc., a Florida based provider of restoration services and emergency and recovery assistance for a purchase price in aggregate of $8 million in cash and common stock. The Company issued 79,850 shares of its common stock to BRC at a fair value of $2.0 million as part of the purchase price and paid in cash $6.0 million. For the purchase price allocation, the Company utilized a third party to calculate the valuation. The purchase consideration for the BRC acquisition has been allocated to the estimated fair market value of the net assets acquired, including approximately $2.2 million in identifiable intangibles assets (brand, customer relations and non-compete), and a residual amount of goodwill of approximately $5.7 million.

Investments

Investments	12 Months Ended
	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Investments	Note 3. Investments The following table details the difference between cost or adjusted/amortized cost and estimated fair value, by major investment category, at December 31, 2017 and December 31, 2016: Cost or Adjusted / Amortized Cost Gross Gains Gross Losses Fair Value (In thousands) December 31, 2017 U.S. government and agency securities $ 39,445 $ 7 $ 572 $ 38,880 States, municipalities and political subdivisions 76,876 104 569 76,411 Special revenue 269,277 524 2,124 267,677 Industrial and miscellaneous 162,093 668 633 162,128 Redeemable preferred stocks 4,767 4 71 4,700 Total fixed maturities 552,458 1,307 3,969 549,796 Nonredeemable preferred stocks 14,450 69 195 14,324 Equity securities 3,098 64 269 2,893 Total equity securities 17,548 133 464 17,217 Total investments $ 570,006 $ 1,440 $ 4,433 $ 567,013 Cost or Adjusted / Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) December 31, 2016 U.S. government and agency securities $ 107,968 $ 29 $ 449 $ 107,548 States, municipalities and political subdivisions 281,935 298 4,872 277,361 Special revenue 53,726 29 759 52,996 Industrial and miscellaneous 129,687 535 577 129,645 Redeemable preferred stocks 3,595 15 149 3,461 Total fixed maturities 576,911 906 6,806 571,011 Nonredeemable preferred stocks 14,935 40 460 14,515 Equity securities 19,255 1,197 2,996 17,456 Total equity securities 34,190 1,237 3,456 31,971 Total investments $ 611,101 $ 2,143 $ 10,262 $ 602,982 Special revenue instruments include U.S. government associated mortgage backed securities. The Company calculates the gain or loss realized on the sale of investments by comparing the sales price (fair value) to the cost or adjusted/amortized cost of the security sold. The Company determines the cost or adjusted/amortized cost of the security sold using the specific-identification method. The following tables detail the Company’s realized gains (losses) by major investment category as of December 31, 2017 and 2016, respectively: 2017 2016 Gains (Losses) Fair Value at Sale Gains (Losses) Fair Value at Sale (In thousands) Year Ended December 31, Fixed maturities $ 2,732 $ 705,138 $ 2,782 $ 70,728 Equity securities 2,131 31,231 108 8,337 Total realized gains 4,863 736,369 2,890 79,065 Fixed maturities (363 ) 56,354 (253 ) 15,496 Equity securities (3,936 ) 11,806 (904 ) 5,098 Total realized losses (4,299 ) 68,160 (1,157 ) 20,594 Net realized gains $ 564 $ 804,529 $ 1,733 $ 99,659 The table below summarizes the Company’s fixed maturities at December 31, 2017 and 2016 by contractual maturity periods. Actual results may differ as issuers may have the right to call or prepay obligations, with or without penalties, prior to the contractual maturity of those obligations. December 31, 2017 Cost or Amortized Cost Percent of Total Fair Value Percent of Total (In thousands) (In thousands) Due in one year or less $ 81,783 15 % $ 81,668 15 % Due after one year through five years 169,452 31 % 168,671 31 % Due after five years through ten years 154,400 28 % 153,463 28 % Due after ten years 146,823 26 % 145,994 26 % Total $ 552,458 100 % $ 549,796 100 % December 31, 2016 Cost or Amortized Cost Percent of Total Fair Value Percent of Total (In thousands) (In thousands) Due in one year or less $ 158,517 28 % $ 158,496 28 % Due after one year through five years 173,221 30 % 172,309 30 % Due after five years through ten years 145,299 25 % 142,259 25 % Due after ten years 99,874 17 % 97,947 17 % Total $ 576,911 100 % $ 571,011 100 % The following table summarizes the Company’s net investment income by major investment category for the years ended December 31, 2017, 2016 and 2015, respectively: For the Year Ended December 31, 2017 2016 2015 (In thousands) Fixed maturities $ 10,368 $ 8,709 $ 6,960 Equity securities 1,922 1,955 1,811 Cash, cash equivalents and short-term investments 960 226 258 Other investments 197 21 259 Net investment income 13,447 10,911 9,289 Investment expenses 2,115 1,730 1,868 Net investment income, less investment expenses $ 11,332 $ 9,181 $ 7,421 During the Company’s quarterly evaluations of its securities for impairment, the Company determined that none of its investments in debt and equity securities that reflected an unrealized loss position were other-than-temporarily impaired. The issuers of the debt securities in which the Company invests continue to make interest payments on a timely basis and have not suffered any credit rating reductions. The Company does not intend to sell, nor is it likely that it would be required to sell, the debt securities before the Company recovers its amortized cost basis. All the issuers of the equity securities it owns had near-term prospects that indicated the Company could recover its cost basis, and the Company also has the ability and the intent to hold these securities until the value equals or exceeds its cost. The following table presents an aging of the Company’s unrealized investment losses by investment class as of December 31, 2017 and December 31, 2016: Less Than Twelve Months Twelve Months or More Number of Securities Gross Unrealized Losses Fair Value Number of Securities Gross Unrealized Losses Fair Value (In thousands) December 31, 2017 U.S. government and agency securities 53 $ 284 $ 20,053 24 $ 289 $ 9,294 States, municipalities and political subdivisions 51 359 49,803 8 210 10,503 Industrial and miscellaneous 284 376 87,898 38 256 11,788 Special revenue 295 777 133,580 183 1,347 69,359 Redeemable preferred stocks 41 66 3,987 17 5 61 Total fixed maturities 724 1,862 295,321 270 2,107 101,005 Nonredeemable preferred stocks 127 188 10,047 6 7 159 Equity securities 11 46 677 12 223 1,095 Total equity securities 138 $ 234 $ 10,724 18 $ 230 $ 1,254 Total 862 $ 2,096 $ 306,045 288 $ 2,337 $ 102,259 Less Than Twelve Months Twelve Months or More Number Gross Losses Fair Number of Securities Gross Unrealized Losses Fair Value (In thousands) December 31, 2016 U.S. government and agency securities 35 $ 448 $ 24,649 2 $ 1 $ 200 States, municipalities and political subdivisions 265 4,869 220,034 2 3 1,497 Industrial and miscellaneous 161 571 56,996 2 6 974 Special revenue 189 631 44,712 11 129 1,828 Redeemable preferred stocks 19 143 2,425 1 6 212 Total fixed maturities 669 6,662 348,816 18 145 4,711 Nonredeemable preferred stocks 77 439 11,298 5 20 234 Equity securities 26 191 2,542 29 2,805 7,317 Total equity securities 103 $ 630 $ 13,840 34 $ 2,825 $ 7,551 Total 772 $ 7,292 $ 362,656 52 $ 2,970 $ 12,262 The Company is required to maintain assets on deposits with various regulatory authorities to support its insurance and reinsurance operations.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 4. Goodwill and Other Intangible Assets As of December 31, 2017, and 2016 goodwill was $152.5 million and $46.5 million, respectively, and intangible assets were $101.6 million and $26.5 million, respectively. The Company has recorded $1.3 million relating to insurance licenses classified as an indefinite lived intangible. Goodwill Goodwill (in thousands) Balance as of December 31, 2015 $ 8,028 Goodwill acquired 38,426 Impairment — Balance as of December 31, 2016 $ 46,454 Goodwill acquired 106,005 Impairment — Balance as of December 31, 2017 $ 152,459 Other intangible assets Our intangible assets resulted primarily from the acquisitions of ZAC and NBIC Holdings and consist of brand, agent relationships, renewal rights, customer relations, trade names, non-compete, value of acquired business and insurance license. Finite-lived intangibles assets are amortized over their useful lives from one to fifteen years. The tables below detail the finite-lived intangible assets, net as of December 31, 2017 and 2016, respectively (amounts in thousands): December 31, 2017 Weighted -average Amortization (years) Gross Carrying Amount Accumulated Amortization Intangible Assets, net (1) Amortizing intangible assets Brand 14 $ 1,210 $ (195 ) $ 1,015 Agent relationships 10 15,500 (789 ) 14,711 Renewal rights 15 57,200 (2,162 ) 55,038 Customer relations 8 870 (211 ) 659 Trade names 10 9,000 (408 ) 8,592 Value of business acquired 1 25,400 (9,083 ) 16,317 Non-compete 2 4,790 (811 ) 3,979 Total intangible assets $ 113,970 $ (13,659 ) $ 100,311 (1) Excludes insurance license valued at $1.3 million and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized. December 31, 2016 Weighted -average Amortization (years) Gross Carrying Amount Accumulated Amortization Intangible Assets, net (1) Amortizing intangible assets Brand 15 $ 1,210 $ (114 ) $ 1,096 Agent relationships 12 4,800 (300 ) 4,500 Renewal rights 15 16,600 (830 ) 15,770 Customer relations 10 870 (123 ) 747 Trade names 10 2,000 (150 ) 1,850 Value of business acquired 1 7,600 (5,700 ) 1,900 Non-compete 2.5 790 (286 ) 504 Total intangible assets $ 33,870 $ (7,503 ) $ 26,367 (1) Excludes insurance license valued at $175,000 and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized. Estimated annual pretax amortization of intangible assets for each of the next five years and thereafter is as follows (in thousands): Year Amount 2018 $ 24,776 2019 $ 8,208 2020 $ 6,365 2021 $ 6,351 2022 $ 6,351 Thereafter $ 48,260 $ 100,311 Amortization expense of intangible assets was $6.2 million and $7.4 million for the years ended December 31, 2017 and 2016, respectively.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Note 5. Earnings Per Share The following table sets forth the computation of basic and diluted EPS for the periods indicated: For the Year Ended December 31, 2017 2016 2015 Basic earnings per share: Net (loss) income attributable to common stockholders (000's) $ (1,119 ) $ 33,865 $ 92,512 Weighted average shares outstanding 26,798,465 29,632,171 30,056,491 Basic (loss) earnings per share: $ (0.04 ) $ 1.14 $ 3.08 Diluted earnings per share: Net (loss) income attributable to common stockholders (000's) $ (1,119 ) $ 33,865 $ 92,512 Weighted average shares outstanding 26,798,465 29,632,171 30,056,491 Weighted average dilutive shares — 2,178 269,977 Total weighted average dilutive shares 26,798,465 29,634,349 30,326,468 Diluted (loss) earnings per share: $ (0.04 ) $ 1.14 $ 3.05 Due to the net loss for 2017, dilutive loss per share is the same as basic due to the antidilutive impact of the convertible debt and restricted stock under the if-converted method. The Company had 8,424,598, 2,049,923 and 2,274,923 of antidilutive shares for the three years ended December 31, 2017, 2016 and 2015, respectively.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 6. Fair Value Measurements For the Company’s investments in U.S. government securities that do not have prices in active markets, agency securities, state and municipal governments, and corporate bonds, the Company obtains the fair values from its third-party valuation service and we evaluate the relevant inputs, assumptions, methodologies and conclusions associated with such valuations. The valuation service calculates prices for the Company’s investments in the aforementioned security types on a month-end basis by using several matrix-pricing methodologies that incorporate inputs from various sources. The model the valuation service uses to price U.S. government securities and securities of states and municipalities incorporates inputs from active market makers and inter-dealer brokers. To price corporate bonds and agency securities, the valuation service calculates non-call yield spreads on all issuers, uses option-adjusted yield spreads to account for any early redemption features, then adds final spreads to the U.S. Treasury curve as of quarter end. The inputs the valuation service uses in their calculations are not quoted prices in active markets, but are observable inputs, and therefore represent Level 2 inputs. The following table presents information about the Company’s assets measured at fair value on a recurring basis. The Company assesses the levels for the investments at each measurement date, and transfers between levels are recognized on the actual date of the event or change in circumstances that caused the transfer in accordance with the Company’s accounting policy regarding the recognitions of transfers between levels of the fair value hierarchy. For the years ended December 31, 2017 and 2016, there were no transfers in or out of Level 1, 2, and 3. December 31, 2017 Total Level 1 Level 2 Level 3 (in thousands) Fixed maturities investments: U.S. government and agency securities $ 38,880 $ 359 $ 38,521 $ — States, municipalities and political subdivisions 76,411 — 76,411 — Special revenue 267,677 — 267,677 — Industrial and miscellaneous 162,128 — 162,128 — Redeemable preferred stocks 4,700 — 4,700 — Total fixed maturities investments $ 549,796 $ 359 $ 549,437 $ — Nonredeemable preferred stocks 14,324 14,324 — — Equity securities 2,893 2,893 — — Total equity securities $ 17,217 $ 17,217 $ — $ — Total investments $ 567,013 $ 17,576 $ 549,437 $ — December 31, 2016 Total Level 1 Level 2 Level 3 (in thousands) Fixed maturities investments: U.S. government and agency securities $ 107,548 $ 103,997 $ 3,551 $ — States, municipalities and political subdivisions 277,361 — 277,361 — Special revenue 52,996 — 52,996 — Industrial and miscellaneous 129,645 — 129,645 — Redeemable preferred stocks 3,461 3,461 — — Total fixed maturities investments $ 571,011 $ 107,458 $ 463,553 $ — Nonredeemable preferred stocks 14,515 14,515 — — Equity securities 17,456 17,456 — — Total equity securities $ 31,971 $ 31,971 $ — $ — Total investments $ 602,982 $ 139,429 $ 463,553 $ — Non-recurring fair value measurements Assets and liabilities that are measured at fair value on a non-recurring basis include intangible assets and goodwill which are recognized at fair value during the period in which an acquisition is completed, from updated estimates and assumptions during the measurement period, or when they are considered to be impaired. These non-recurring fair value measurements, primarily for intangible assets acquired, were based on Level 3 unobservable inputs. During 2017 and 2016 these non-recurring fair values inputs consisted of brand, agent relationships, renewal rights, customer relations, trade names, VOBA, non-compete and goodwill. In the event of an impairment, we determine the fair value of the goodwill and intangible assets using a combination of a discounted cash flow approach and market approaches, which contain significant unobservable inputs and therefore is considered a Level 3 fair value measurement. The unobservable inputs in the analysis generally include future cash flow projections and a discount rate. There were no non-recurring fair value adjustments to intangible assets and goodwill during 2017, 2016 and 2015 except for certain fair value measurements during 2016 and 2015 following the acquisition of Zephyr and BRC, respectively. The measurement period may be up to one year from the acquisition date. We record any measurement period adjustments to the fair value of assets acquired and liabilities assumed, with the corresponding offset to goodwill.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Property and Equipment	Note 7. Property and Equipment Property and equipment, net consists of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 December 31, 2016 (In thousands) Land $ 2,582 $ 2,582 Building 12,148 10,301 Computer hardware and software 4,093 3,113 Office furniture and equipment 759 759 Tenant and leasehold improvements 3,660 3,334 Vehicle fleet 815 842 Total, at cost 24,057 20,931 Less: accumulated depreciation and amortization 5,309 3,752 Property and equipment, net $ 18,748 $ 17,179 Depreciation expense for the years ended December 31, 2017, 2016 and 2015 was $1.6 million, $1.6 million, $1.3 million, respectively. The Company’s real estate consists of 15 acres of land, five buildings with a gross area of 229,000 square feet and a parking garage. Expected annual rental income due under non-cancellable operating leases for our real estate properties is as follows (in thousands): Year Amount January 1 to December 31, 2018 $ 2,458 January 1 to December 31, 2019 2,461 January 1 to December 31, 2020 2,521 January 1 to December 31, 2021 2,581 January 1 to December 31, 2022 2,636 Thereafter 2,063 $ 14,720

Deferred Policy Acquisition Cos

Deferred Policy Acquisition Costs	12 Months Ended
	Dec. 31, 2017
Insurance [Abstract]
Deferred Policy Acquisition Costs	Note 8. Deferred Policy Acquisition Costs The Company defers certain costs in connection with written policies, called Deferred Policy Acquisition Costs (“DPAC”), net of corresponding amounts of ceded reinsurance commissions, called Deferred Reinsurance Ceding Commissions (“DRCC”). Net DPAC is amortized over the effective period of the related insurance policies. The Company anticipates that its DPAC costs will be fully recoverable in the near term. The table below depicts the activity with regard to DPAC for the years ended December 31, 2017 and 2016: For the Year Ended December 2017 2016 (In thousands) Beginning Balance $ 42,779 $ 34,800 Policy acquisition costs incurred 82,791 92,400 Amortization (83,892 ) (84,421 ) Ending Balance $ 41,678 $ 42,779

Reinsurance

Reinsurance	12 Months Ended
	Dec. 31, 2017
Insurance [Abstract]
Reinsurance	Note 9. Reinsurance The Company’s reinsurance program is designed, utilizing the Company’s risk management methodology, to address its exposure to catastrophes or large non-catastrophic losses. The Company’s program provides reinsurance protection for catastrophes including hurricanes, tropical storms, tornadoes and winter storms. The Company’s reinsurance agreements are part of its catastrophe management strategy, which is intended to provide its stockholders an acceptable return on the risks assumed in its property business, and to reduce variability of earnings, while providing protection to the Company’s policyholders. 2017 – 2018 Reinsurance Program Heritage P&C and Zephyr Program The reinsurance program, which is segmented into layers of coverage, protects the Company for excess property catastrophe losses and loss adjustment expenses. The Company’s 2017-2018 reinsurance program incorporates the mandatory coverage required by law to be placed with FHCF, which is available only for Florida catastrophe risk. For the 2017 hurricane season, the Company maintained the prior year selected participation percentage in the FHCF at 45%. The Company also purchased private reinsurance below and alongside the FHCF layer, as well as aggregate reinsurance coverage. The Company is not utilizing its captive, Osprey, for any catastrophe risk for the 2017 hurricane season. The Company has a primary retention of the first $20 million of losses and loss adjustment expenses. Additionally, the December 1, 2016 treaty between Heritage P&C and Osprey was commuted effective June 1, 2017. Heritage P&C provides property insurance coverage for states other than Hawaii. The following describes the various layers of its June 1, 2017 to May 31, 2018 reinsurance program: • Heritage P&C’s Retention . If a first catastrophic event strikes a Heritage P&C risk, its primary retention is the first $20 million ($15 million plus $5 million co-participation on the Top and Aggregate layer described below) of losses and loss adjustment expenses. If a second catastrophic event strikes a Heritage P&C risk, its primary retention decreases to $16 million and the remainder of the losses are ceded to third parties. In a first event exceeding approximately $878 million, there is an additional co-participation of 20% subject to a maximum co-participation of $727,000. Assuming a 1-100yr 1 st st • Shared Layers . Immediately above the retention, the Company has purchased $372 million of reinsurance from third party reinsurers . This coverage includes the following layers: Top and Aggregate layer, Underlying layer, Layer 1, Layer 2 and a private sliver alongside those layers. Through the payment of a reinstatement premium, Heritage P&C and Zephyr are able to reinstate $352 million of this reinsurance one time. There is $20 million of shared coverage subject to a seasonal aggregate of $68 million. • FHCF Layer . Heritage P&C’s FHCF program provides coverage for Florida events only and includes an estimated maximum provisional limit of 45% of $1.3 billion, in excess of its retention of $414 million. The limit and retention of the FHCF coverage is subject to upward or downward adjustment based on, among other things, submitted exposures to FHCF by all participants. Heritage P&C has purchased coverage alongside from third party reinsurers and through reinsurance agreements with Citrus Re. To the extent the FHCF coverage is adjusted, this private reinsurance with third party reinsurers and Citrus Re will adjust to fill in any gaps in coverage up to the reinsurers’ aggregate limits for this layer. The FHCF coverage cannot be reinstated once exhausted, but it does provide coverage for multiple events. • Layers alongside the FHCF. The Heritage P&C reinsurance program includes third party layers alongside the FHCF. These include 2015 B and 2015 C series catastrophe bonds, 2016 D and 2016 E catastrophe bonds and 2017-2 catastrophe bonds issued by Citrus Re, which total $412.5 million of coverage, as discussed below, as well as a traditional reinsurance layer providing $5 million of coverage. • 2017-2 Notes: During May 2017, Heritage P&C entered into a catastrophe reinsurance agreement with Citrus Re. The agreements provide for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2017. Heritage P&C pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued an aggregate of $35 million of principal-at-risk variable notes due March 2020 to fund the reinsurance trust account and its obligations to Heritage P&C for $35 million of coverage under the reinsurance agreements. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. • 2016 Class D and E Notes: During February 2016, Heritage P&C and Zephyr entered into two catastrophe reinsurance agreements with Citrus Re. The agreements provide for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2016. For the 2017 hurricane seasons these notes provide coverage only to Heritage P&C who pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued an aggregate of $250 million of principal-at-risk variable notes due February 2019 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The Class D notes provide $150 million of coverage and the Class E notes provide $100 million of coverage. The Class D and Class E notes provide reinsurance coverage for a sliver of the catastrophe coverage that had previously been provided by the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. • 2015 Class B and C Notes : During April 2015, Heritage P&C entered into catastrophe reinsurance agreements with Citrus Re. The agreements provide for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2015. Heritage P&C pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued principal-at-risk variable notes due April 2018 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The Class B notes provide $97.5 million of coverage, and the Class C notes provide $30 million of coverage. The Class B and Class C notes provide reinsurance coverage for a sliver of the catastrophe coverage that had previously been provided by the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. Layers above the FHCF - Florida program • 2017-1 Notes: During March 2017, Heritage P&C entered into catastrophe reinsurance agreements with Citrus Re. The agreements provide for three-years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2017. Heritage P&C pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued principal-at-risk variable notes due March 2020 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The notes provide $125 million of coverage for a layer above the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. • 2015 Class A Notes: During April 2015, Heritage P&C entered into catastrophe reinsurance agreements with Citrus Re. The agreements provide for three-years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2015. Heritage P&C pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued principal-at-risk variable notes due April 2018 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The Class A notes provide $150 million of coverage for a layer above the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. • Multi-Zonal Layers. The Company purchased additional layers which provide coverage for Heritage P&C for a second event and both first and second event coverage for Hawaii. The first event coverage for Hawaii is a counterpart to the multi-state catastrophe bond layers and FHCF layer. There is a total of $254 million of reinsurance coverage purchased on this basis, which the Company is able to reinstate one time through the payment of a reinsurance reinstatement premium. • Aggregate Coverage . In addition to what is described above, much of the reinsurance is structured in a way to provide aggregate coverage. $984 million of limit is structured on this basis (Top and Aggregate, Underlying, Layer 1, Layer 2, Private layers, Multi-Zonal, 2017-1 Notes, 2017-2 Notes, and 2015 Class A Notes). To the extent that this coverage is not fully exhausted in the first catastrophic event, it provides coverage commencing at its reduced retention for second and subsequent events where underlying coverage has been previously exhausted The Company paid a reinsurance reinstatement premium for $606 million of this coverage , which can be a reinstated one time. Layers (with exception to FHCF, 2016 Class D & E Notes, and 2015 Class B & C Notes) are “net” of a $40 million attachment point. Layers inure to the subsequent layers if the aggregate limit of the preceding layer(s) is exhausted, and the subsequent layer cascades down in its place. Zephyr provides property insurance coverage for Hawaii. The various layers of its 2017-2018 reinsurance program area as follows: • Zephyr’s Retention . If a first catastrophic event strikes Hawaii, Zephyr has a primary retention of the first $20 million ($15 million plus $5 million co-participation on the Top and Aggregate layer) of losses and loss adjustment expenses. If a second event strikes Hawaii, Zephyr’s primary retention decreases to $16 million and the remainder of losses are ceded to third parties. In a first event exceeding approximately $386 million, there is an additional co-participation of 3.8% subject to a maximum co-participation of $12 million. Assuming a 1-100-year event, a second event exceeding approximately $386 million results in an additional co-participation of 117.7%, subject to a maximum co-participation of $56 million. Zephyr has a $16 million primary retention for events beyond the second catastrophic event. • Shared Layers above retention . Immediately above the retention, the Company has purchased $372 million of reinsurance from third party reinsurers. This coverage includes the following layers: Top and Aggregate layer, Underlying layer, Layer 1, Layer 2 and a private sliver alongside those layers. Through the payment of a reinsurance reinstatement premium, Heritage P&C and Zephyr are able to reinstate $352 million of this reinsurance one time. There is $20 million of shared coverage subject to a seasonal aggregate of $68 million. • Multi-Zonal Layers. The Company purchased additional layers which provide coverage for Florida for a second event and both first and second event coverage for Hawaii. The first event coverage for Hawaii is a counterpart to the multi-state catastrophe bond layers and FHCF layer. There is a total of $302 million of reinsurance coverage purchased on this basis, of which $254 million can be reinstated through the payment of reinsurance restatement premium. The multi-zonal occurrence layer provides first and second event coverage of $254 million for Hawaii and second event coverage of $254 million for Florida. A Top and Aggregate multi-zonal layer provides first event coverage of $48 million for Hawaii and second or subsequent event coverage of $48 million for Florida. • Top Hawaii only layer. Zephyr has an additional layer purchased from third party reinsurers which provides $26 million of coverage for Hawaii only losses. This layer has one free reinstatement. • Aggregate Coverage . In addition to what is described above, much of the reinsurance is structured in a way to provide aggregate coverage. An aggregate of $700 million of limit is structured on this basis (Top and Aggregate, Underlying, Layer 1, Layer 2, Private Layers, Multi-Zonal, Hawaii Only). To the extent that this coverage is not fully exhausted in the first catastrophic event, it provides coverage commencing at its reduced retention for second and subsequent events where underlying coverage has been previously exhausted. $632 million can be reinstated through the payment of a reinsurance premium. For a first catastrophic event striking Florida, our reinsurance program provides coverage up to $1.75 billion of losses and loss adjustment expenses, including our retention, and we are responsible for all losses and loss adjustment expenses in excess of such amount. For a first catastrophic event striking Hawaii, our reinsurance program provides coverage up to $731 million of losses and loss adjustment expenses, including our retention, and we are responsible for all losses and loss adjustment expenses in excess of such amount. For subsequent catastrophic events, our total available coverage depends on the magnitude of the first event, as we may have coverage remaining from layers that were not previously fully exhausted. An aggregate of $632 million of limit purchased in 2017 includes reinstatement through the purchase of reinsurance reinstated premium. In total, we have purchased $2.6 billion of potential reinsurance coverage, including our retention, for multiple catastrophic events. Our ability to access this coverage, however, will be subject to the severity and frequency of such events. Hurricane losses in states other than Hawaii would be covered under the Heritage P&C program with the exception of the FHCF coverage and the series 2015, 2016 and 2017 catastrophe bonds. Management deemed this reinsurance protection to be sufficient given the level of catastrophe exposure in 2017 for Alabama, Georgia, North Carolina and South Carolina. NBIC Program NBIC, our insurance subsidiary located in Rhode Island, provides property insurance coverage in the states of Connecticut, Massachusetts, New Jersey, New York and Rhode Island. NBIC’s catastrophe reinsurance program provides coverage for loss occurrences up to $1 billion (1:100-year event) on the first event and includes automatic reinstatement protection. The program includes coverage for catastrophic events such as severe winter storms, hurricanes and tornadoes. During 2017, NBIC’s net retention for a catastrophic event of up to $1.0 billion is $1.3 million. NBIC’s reinsurance program also covers non catastrophic losses. A summary of NBIC’s combined reinsurance protection follows. The reinsurance program is placed with strong participation from leading reinsurers across global markets with no one reinsurer exceeding 10%. The reinsurance partners are all rated A- to A+ by Standard and Poor’s. Property Catastrophe Excess of Loss NBIC’s property catastrophe program protects NBIC from the aggregation of losses in a single occurrence. Reinstatement provisions (one reinstatement at 100% of premium) on the first three layers and a portion of the fourth layer provides protection for NBIC from a second catastrophic event. The program is 81.25% placed, with the remaining 18.75% of catastrophe protection coming from NBIC’s gross quota share contract. NBIC’s net retention of $20 million is further reduced with a net quota share reinsurance contract described below. Reinstatement Premium Protection NBIC’s Reinstatement Premium Protection locks in the cost of a potential reinstatement premium charge that would occur should an event trigger catastrophe reinsurance. NBIC buys reinstatement premium protection for the first three layers and a portion of the fourth catastrophe excess of loss layers. Aggregate Contract For the year ended December 31, 2017, NBIC had 25% of an Aggregate contract, in two sections: • Section 1: $20 million excess $21.5 million in the aggregate for all catastrophe losses excluding named tropical storms. • Section 2: $12 million excess $8 million for named tropical storm losses. NBIC placed 25% of an aggregate contract on December 31, 2017, expiring May 31, 2018. The limit on the contract is $13.5 million, retention of $18.5 million and franchise deductible of $1.0 million. Gross Quota Share NBIC purchased an 18.75% gross account quota share reinsurance treaty which provides ground up loss recoveries of up to $1 billion. Net Lines Quota Share NBIC’s net lines quota share is proportional reinsurance for which certain of our other reinsurance inures to the quota share (property catastrophe excess of loss and reinstatement premium protection and the second layer of the general excess of loss.) An occurrence limit of $20 million for catastrophe losses is in effect on the quota share, subject to certain aggregate loss limits that vary by reinsurer. The amount and rate of reinsurance commissions slide, within a prescribed minimum and maximum, depending on loss performance. NBIC ceded 60% of net premiums and losses during 2017 to the Net Quota Share. The net quota share program was renewed on December 31, 2017 ceding 49.5% of the net premiums and losses and 8% of the prior year quota share will runoff. General Excess of Loss NBIC’s general excess of loss reinsurance protects NBIC from single risk losses, both property and casualty. The casualty coverage provided by this contract also responds on a “Clash” basis, meaning that multiple policies involved in a single loss occurrence can be aggregated into one loss and applied to the reinsurance contract. The coverage is in two layers in excess of NBIC’s retention of the first $300,000 of loss. The first layer is $450,000 excess $300,000 and the second layer is $2.75 million excess $750,000 (Casualty second layer is $1.25 million excess $750,000). Both layers are 81.25% placed with the gross quota share providing the additional 18.75% coverage. Semi-Automatic Facultative Excess of Loss NBIC’s automatic property facultative reinsurance protects NBIC from single risk losses, for property risks with a total insured value excess of $3.5 million subject to a limit of $2.5 million. Product specific reinsurance for Umbrella and Home Systems Protection NBIC’s umbrella facultative program protects NBIC’s Umbrella Liability business through the quota share reinsurance contract. NBIC has limits of liability of up to $1 million with 90% quota share, subject to an additional limit of liability of up to $4 million with 100% quota share. The home system protection (HSP) product is designed to protect customers from sudden and accidental mechanical breakdowns to furnaces, boilers, HVAC systems, home entertainment systems, pool heating and filtering equipment, and other mechanical systems that are not covered by standard homeowners’ insurance policies. The coverage is included in NBIC’s base policy and is 100% reinsured through Hartford Steam Boiler. 2016 - 2017 Reinsurance Program The Company placed its reinsurance program for the period from June 1, 2016 through May 31, 2017 during the second quarter of 2016. This reinsurance program incorporated the catastrophe risk of our two insurance subsidiaries, Heritage P&C and Zephyr into one reinsurance structure. The programs were incorporated into one reinsurance structure and was allocated amongst traditional reinsurers, catastrophe bonds issued by Citrus Re Ltd., a Bermuda special purpose insurer formed in 2014 (“Citrus Re”), and the Florida Hurricane Catastrophe Fund (“FHCF”). Coverage was shared by both insurers unless otherwise noted. The 2016-2017 reinsurance program provides, including retention, first event coverage up to $1.9 billion in Florida, first event coverage up to $1.1 billion in Hawaii, and multiple event coverage up to $3.1 billion. The reinsurance program, which was segmented into layers of coverage, protected the Company for excess property catastrophe losses and loss adjustment expenses. The Company’s 2016-2017 reinsurance program incorporated the mandatory coverage required by law to be placed with FHCF, which was available only for Florida catastrophe risk. For the 2016 hurricane season, the Company reduced its selected participation percentage in the FHCF from 75% to 45%. The Company also purchased private reinsurance below, alongside and above the FHCF layer, as well as aggregate reinsurance coverage. The following describes the various layers of the Company’s June 1, 2016 to May 31, 2017 reinsurance program. • The Company’s Retention . If a first catastrophic event strikes Florida, the Company had a primary retention of the first $40 million of losses and loss adjustment expenses, of which Osprey was responsible for $20 million. If a first catastrophic event strikes Hawaii, the Company had a primary retention of the first $30 million of losses and loss adjustment expenses, of which Osprey was responsible for $15 million. If a second event strikes Florida, Heritage P&C’s primary retention decreases to $15 million and the remainder of the losses are ceded to third parties. If a second event strikes Hawaii, Zephyr’s primary retention decreases to $5 million. In the second event only for a loss exceeding $190 million, there was an additional Company co-participation of 5.4% subject to a maximum co-participation of $11.6 million. Heritage P&C and Zephyr each had a $5 million primary retention for events beyond the second catastrophic event. Osprey had no primary retention beyond the first catastrophic event in Florida or Hawaii. Additionally, Osprey was responsible for payment of up to $5.3 million of reinstatement premium, depending on the amount of losses incurred. • Shared Layers above retention and below FHCF . Immediately above the retention, the Company had purchased $374 million of reinsurance from third party reinsurers. Through the payment of a reinstatement premium, the Company can reinstate the full amount of this reinsurance one time. To the extent that $374 million or a portion thereof was exhausted in a first catastrophic event, the Company had purchased reinstatement premium protection insurance to pay the required premium necessary for the reinstatement of this coverage. • FHCF Layer . The Company’s FHCF program provided coverage for Florida events only and includes an estimated maximum provisional limit of 45% of $1.5 billion, more than its retention of $460 million. The limit and retention of the FHCF coverage was subject to upward or downward adjustment based on, among other things, submitted exposures to FHCF by all participants. The Company had purchased coverage alongside from third party reinsurers and through reinsurance agreements with Citrus Re. To the extent the FHCF coverage was adjusted, this private reinsurance with third party reinsurers and Citrus Re would adjust to fill in any gaps in coverage up to the reinsurers’ aggregate limits for this layer. The FHCF coverage cannot be reinstated once exhausted, but it did provide coverage for multiple events. • Layers alongside the FHCF. The Florida reinsurance program includes third party layers alongside the FHCF. These include 2015 C and 2015 B series catastrophe bonds, which cover Florida only for the 2016 season, and 2016 D and 2016 E catastrophe bond series issued by Citrus Re, which total $377.5 million of coverage, as discussed below, as well as a traditional reinsurance layer providing $200 million of coverage. Through a reinstatement, the Company can reinstate the full amount of the $200 million of reinsurance one time. These 2016 catastrophe bonds and the traditional reinsurance layer provide coverage for both Florida and Hawaii catastrophe losses. • 2016 Class D and E Notes: During February 2016, Heritage P&C and Zephyr entered into two catastrophe reinsurance agreements with Citrus Re. The agreements provided for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2016. Heritage P&C and Zephyr paid a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued an aggregate of $250 million of principal-at-risk variable notes due February 2019 to fund the reinsurance trust account and its obligations to Heritage P&C and Zephyr under the reinsurance agreements. The Class D notes provided $150 million of coverage and the Class E notes provided $100 million of coverage. The Class D and Class E notes provided reinsurance coverage for a sliver of the catastrophe coverage that had previously been provided by the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C and Zephyr. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. • 2015 Class B and C Notes : During April 2015, Heritage P&C entered into catastrophe reinsurance agreements with Citrus Re. The 2015 notes do not provide coverage for Zephyr for the 2016 hurricane season. The agreements provided for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2015. Heritage P&C paid a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued principal-at-risk variable notes due April 2018 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The Class B notes provide $97.5 million of coverage, and the Class C notes provide $30 million of coverage. The Class B and Class C notes provide reinsurance coverage for a sliver of the catastrophe coverage that had previously been provided by the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. Layers above the FHCF - Florida program • 2015 Class A Notes: During April 2015, Heritage P&C entered into catastrophe reinsurance agreements with Citrus Re. The 2015 notes do not provide coverage for Zephyr for the 2016 hurricane season. The agreements provided for three years of coverage from catastrophic losses caused by named storms, including hurricanes, beginning on June 1, 2015. Heritage P&C pays a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued principal-at-risk variable notes due April 2018 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The Class A notes provided $150 million of coverage for a layer above the FHCF. The limit of coverage is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. • 2014 Class A Notes: Coverage immediately below and above the 2015 Class A notes is provided by the 2014 reinsurance agreements entered into with Citrus Re. The first contract with Citrus Re provides $150 million of coverage immediately below 2015 Class A, and the second contract provides an additional $50 million of coverage which sits immediately above 2015 Class A. During April 2014, Heritage P&C entered into two catastrophe reinsurance agreements with Citrus Re. The 2014 notes do not provide coverage for Zephyr for the 2016 hurricane season. The agreements provided for three years of coverage from catastrophe losses caused by certain named storms, including hurricanes, beginning on June 1, 2014. The limit of coverage of $200 million is fully collateralized by a reinsurance trust account for the benefit of Heritage P&C. Heritage P&C paid a periodic premium to Citrus Re during this three-year risk period. Citrus Re issued $200 million of principal-at-risk variable notes due April 2017 to fund the reinsurance trust account and its obligations to Heritage P&C under the reinsurance agreements. The maturity date of the notes may be extended up to two additional years to satisfy claims for catastrophic events occurring during the three-year term of the reinsurance agreements. • Multi-Zonal Layers – The Company purchased additional layers which provided coverage for Florida for a second event and both first and second event coverage for Hawaii. The first event coverage for Hawaii is a counterpart to the Florida-only catastrophe bond layers and FHCF layer. There was a total of $282 million of reinsurance coverage purchased on this basis, with $260 million having a prepaid reinstatement. The multi-zonal occurrence layer provided first and second event coverage of $260 million for Hawaii and second event coverage of $260 million for Florida. A top and drop multi-zonal layer provided first and subsequent event coverage of $22 million for Hawaii and second or subsequent event coverage of $22 million for Florida. • Aggregate Coverage . In addition to what is described above, much of the reinsurance is structured in a way to provide aggregate coverage. $682 million of limit was structured on this basis. To the extent that this coverage is not fully exhausted in the first catastrophic event, it provided coverage commencing at its reduced retention for second and subsequent events where underlying coverage has been previously exhausted. $460 million had a reinstatement, which is prepaid. For a first catastrophic event striking Florida, our reinsurance program provided coverage for $1.9 billion of losses and loss adjustment expenses, including our retention, and we were responsible for all losses and loss adjustment expenses in excess of such amount. For a first catastrophic event striking Hawaii, our reinsurance program provided coverage for $1.1 billion of losses and loss adjustment expenses, including our retention, and we are responsible for all losses and loss adjustment expenses in excess of such amount. For subsequent catastrophic events, our total available coverage depends on the magnitude of the first event, as we may have coverage remaining from layers that were not previously fully exhausted. $860 million of limit purchased in 2016 includes a reinstatement, with $825 million being prepaid. In total, we have purchased $3 billion of potential reinsurance coverage, including our retention, for multiple catastrophic events. Our ability to access this coverage, however, was subject to the severity and frequency of such events. 2015 – 2016 Reinsurance Program During the second quarter of 2015, the Company placed its reinsurance program for the period from June 1, 2015 through May 31, 2016. The Company’s 2015-2016 reinsurance program incorporated the mandatory coverage required by law to be placed with FHCF. For the 2015 hurricane season, the Company selected 75% participation in the FHCF. The Company also purchased private reinsurance below, alongside and above the FHCF layer, as well as aggregate reinsurance coverage. The following describes the various layers of the Company’s June 1, 2015 to May 31, 2016 reinsurance program. • The Company’s Retention . For the first catastrophic event, the Company had a primary retention of the first $35 million of losses and loss adjustment expenses, of Osprey was responsible for $20 million. For a second event, Heritage P&C’s primary retention decreased to $5 million and Osprey is responsible for $10 million. To the extent that there is reinsurance coverage remaining, Heritage P&C has a $5

Reserve For Unpaid Losses

Reserve For Unpaid Losses	12 Months Ended
	Dec. 31, 2017
Insurance [Abstract]
Reserve for Unpaid Losses	Note 10. Reserve For Unpaid Losses The Company determines the reserve for unpaid losses on an individual-case basis for all incidents reported. The liability also includes amounts which are commonly referred to as incurred but not reported, or “IBNR”, claims as of the balance sheet date. We estimate our IBNR reserves by projecting our ultimate losses using industry accepted actuarial methods and then deducting actual loss payments and case reserves from the projected ultimate losses. The table below summarizes the activity related to the Company’s reserve for unpaid losses: For the Year Ended December 31, 2017 2016 2015 Balance, beginning of period $ 140,137 $ 83,722 $ 51,469 Less: reinsurance recoverable on unpaid losses 589 — — Net balance, beginning of period 139,548 83,722 51,469 Incurred related to: Current year 188,914 220,071 146,484 Prior years 12,567 18,791 (5,293 ) Total incurred 201,481 238,862 141,191 Paid related to: Current year 114,344 120,626 81,673 Prior years 107,479 62,407 27,265 Total paid 221,823 183,033 108,938 Total unpaid claims assumed from acquisitions 35,524 — — Net balance, end of period 154,730 139,551 83,722 Plus: reinsurance recoverable on unpaid losses 315,353 586 — Balance, end of period $ 470,083 $ 140,137 $ 83,722 The Company writes insurance in the states of Alabama, Connecticut, Florida, Georgia, Hawaii, Massachusetts, New Jersey, New York, North Carolina, Rhode Island and South Carolina, which could be exposed to hurricanes or other natural catastrophes. Although the occurrence of a major catastrophe could have a significant effect on our monthly or quarterly results, such an event is unlikely to be so material as to disrupt our overall normal operations. However, the Company is unable to predict the frequency or severity of any such events that may occur in the near term or thereafter. The Company believes that the reserve for unpaid losses reasonably represents the amount necessary to pay all claims and related expenses which may arise from incidents that have occurred as of the balance sheet date. The Company’s losses incurred for the years ended December 31, 2017 and 2016 reflect prior year development of $12.6 million and $18.8 million, respectively, associated with management’s best estimate of the actuarial loss and LAE reserves with consideration given to Company specific historical loss experience. The Company recorded unfavorable development of $6.5 million for claims associated with Hurricanes Hermine and Matthew in 2017. Management’s strengthening of reserves for personal lines non-hurricane losses accounted for most of the remainder of the prior year development recorded. Most of the unfavorable emergence recorded in 2016 came from the second, third and fourth quarters of 2015, primarily related to claims involving litigation and claims that were represented by attorneys, public adjusters or others (sometimes referred to as Assignment of Benefits). The following is information about incurred and paid claims development as of December 31, 2017, net of reinsurance, as well as cumulative claim frequency and the total of incurred-but-not-reported liabilities plus expected development on reported claims included within the net incurred claims amounts. Heritage P&C and Zephyr Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (in thousands, except number of claims) Unaudited Accident year 2012 2013 2014 2015 2016 2017 Net IBNR Reserves Reported Claims 2012 $ 1,396 $ 851 $ 811 $ 784 $ 797 $ 823 $ 21 134 2013 37,005 35,819 37,212 37,090 38,537 1,220 3,618 2014 91,839 86,508 86,634 88,423 1,606 7,801 2015 141,125 159,899 166,222 9,466 11,177 2016 207,183 212,540 12,901 15,613 2017 171,585 59,979 40,826 Total $ 678,130 $ 85,193 Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance Unaudited Accident year 2012 2013 2014 2015 2016 2017 2012 $ 12 $ 615 $ 695 $ 756 $ 766 $ 631 2013 18,625 29,023 32,414 35,322 36,497 2014 47,408 70,932 79,341 84,421 2015 76,310 130,267 147,188 2016 107,771 184,397 2017 89,110 Total $ 542,244 Reconciliation of Reserve Balances to Liability for Unpaid Loss and Loss Adjustment Expenses Unpaid Loss and Allocated Loss Adjustment Expense, Net of Reinsurance $ 135,886 Ceded Unpaid Loss and Allocated Loss Adjustment Expense 238,508 Unpaid Unallocated Loss Adjustment Expense 1,800 Unpaid losses and loss adjustment expenses $ 376,194 Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance as of December 31, 2017 (Unaudited) Year - 1 Year - 2 Year - 3 Year - 4 Year - 5 Thereafter Percentage 52% 32% 5% 6% 0% 5% Narragansett Bay Insurance Company and Pawtucket Insurance Company Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (in thousands, except number of claims) Unaudited Unaudited Accident year 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Net IBNR Reserves Reported Claims 2008 and prior $ 1,796 $ 1,502 $ 1,478 $ 1,576 $ 1,485 $ 1,485 $ 1,485 $ 1,485 $ 1,484 $ 1,483 $ 325 233 2009 3,664 3,069 3,095 3,160 3,205 3,205 3,196 3,187 3,191 — 502 2010 11,607 11,217 11,083 11,417 11,538 11,547 11,559 11,547 2 2,160 2011 35,433 37,424 37,029 37,752 37,117 36,822 36,726 6 10,877 2012 48,175 51,778 53,051 52,364 52,482 52,884 84 39,431 2013 24,152 25,664 25,757 25,076 23,817 303 9,464 2014 27,152 28,391 27,213 26,561 917 10,622 2015 38,130 37,845 37,570 1,175 14,377 2016 30,024 30,071 1,844 10,672 2017 17,578 2,508 10,576 $ 241,428 $ 7,164 Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance Unaudited Accident year 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2008 and prior $ 1,047 $ 1,335 $ 1,319 $ 1,406 $ 1,485 $ 1,483 $ 1,484 $ 1,484 $ 1,484 $ 1,483 2009 1,794 2,778 2,788 2,992 3,058 3,128 3,186 3,186 3,188 2010 8,589 10,194 10,418 10,792 11,024 11,309 11,336 11,333 2011 28,767 35,575 35,953 36,546 36,800 36,711 36,683 2012 42,427 49,422 49,873 50,558 50,879 51,735 2013 17,146 21,693 23,175 22,325 22,898 2014 21,324 24,144 22,115 24,088 2015 27,608 32,387 34,484 2016 24,908 27,115 2017 14,038 $ 227,045 Reconciliation of Reserve Balances to Liability for Unpaid Loss and Loss Adjustment Expenses Unpaid Loss and Allocated Loss Adjustment Expense, Net of Reinsurance $ 14,383 Ceded Unpaid Loss and Allocated Loss Adjustment Expense 76,845 Unpaid Unallocated Loss Adjustment Expense 2,661 Unpaid losses and loss adjustment expenses $ 93,889 Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance as of December 31, 2017 (Unaudited) Year 1 2 3 4 5 6 7 8 9 10 Thereafter Percentage 75% 16% 1% 3% 2% 1% 1% 0% 0% 0% 1%

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Long-Term Debt	Note 11. Long-Term Debt Senior Secured Notes On December 15, 2016, we issued $79.5 million aggregate amounts of Senior Secured Notes (“Secured Notes”) to six accredited investors. The Secured Notes bear interest of 8.75% per annum plus the three-month average of LIBOR. Principal and interest is paid quarterly. Interest payments commenced on March 15, 2017 and the quarterly principal payments commence on December 31, 2018. At December 31, 2017, we owed $73.7 million on the Secured Notes, net of issuance costs which totaled approximately $5.7 million. For the year ended December 31, 2017, the Company made interest payments of approximately $8.0 million. The Secured Notes contain customary restrictive covenants relating to merger, modification of the indenture, subordination, issuance of debt securities and sale of assets, the most significant of which include limitations with respect to certain designated subsidiaries on the incurrence of additional indebtedness or guarantees secured by any security interest on any shares of their capital stock. The Secured Notes covenants also limit the Company’s ability to sell or otherwise dispose of any shares of capital stock of such designated subsidiaries. The Secured Notes do not have the benefit of any sinking funds. They also contain customary limitations and lien provisions as well as customary events of default provisions, which if breached, could result in the accelerated maturity of the Secured Notes. The Company was in compliance with the Senior Notes covenants for the year ended December 31, 2017. Subject to the replacement capital covenant, the Secured Notes may be redeemed, in whole or in part, at any time on or after December 15, 2018, based on the quarterly payment date, at the following redemption prices (as a percentage of outstanding principal amount of the notes to be redeemed) plus accrued and unpaid interest and principal: 2018 – 103%; 2019 – 102%; 2020 – 101%; and thereafter at 100%. If there is a change in control, a holder has the right to require the Company to purchase such holder’s Secured Notes at a price in cash equal to 101% of the principal amount thereof, plus accrued and unpaid interest, if any. At December 31, 2017, the effective interest rate, considering the stated interest expense and amortization of debt issuance costs, approximates 10%. Convertible Senior Notes On August 16, 2017, the Company issued $125.0 million aggregate principal amount of 5.875% Convertible Senior Notes due 2037 (the “Convertible Notes”) under an Indenture (the “Indenture”) by and among the Company, as issuer, Heritage MGA, LLC, as guarantor, and a third-party trustee (the “Trustee”). The Convertible Notes were issued in a private placement transaction pursuant to Rule 144A under the Securities Act, as amended. On September 7, 2017, the Company issued an additional $11.75 million in aggregate principal amounts of Convertible Notes pursuant to the initial purchaser’s option. The Convertible Notes bear interest at a rate of 5.875% per year. Interest accrues from August 16, 2017 and will be payable semi-annually in arrears, on February 1 and August 1 of each year, beginning on February 1, 2018. The Convertible Notes are senior unsecured obligations of the Company that will rank senior in right of payment to the Company’s future indebtedness that is expressly subordinated in right of payment to the Convertible Notes; equal in right of payment to the Company’s unsecured indebtedness that is not so subordinated; effectively junior to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness or other liabilities incurred by the Company’s subsidiaries other than the Guarantor, which will fully and unconditionally guarantee the Convertible Notes on a senior unsecured basis. The Convertible Notes will mature on August 1, 2037 (the “Maturity Date”), unless earlier repurchased, redeemed or converted. Holders may convert their Convertible Notes at any time prior to the close of business on the business day immediately preceding February 1, 2037, other than during the period from, and including, February 1, 2022 to the close of business on the second business day immediately preceding August 5, 2022, only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2017, if the closing sale price of the Company’s common stock, for at least 20 trading days (whether or not consecutive) in the period of 30 consecutive trading days ending on the last trading day of the calendar quarter immediately preceding the calendar quarter in which the conversion occurs, is more than 130% of the conversion price of the Convertible Notes in effect on each applicable trading day; (2) during the ten consecutive business-day period following any five consecutive trading-day period in which the trading price for the Convertible Notes for each such trading day was less than 98% of the closing sale price of the Company’s common stock on such date multiplied by the then-current conversion rate; (3) if the Company calls any or all of the Convertible Notes for redemption, at any time prior to the close of business on the second business day immediately preceding the redemption date; or (4) upon the occurrence of specified corporate events. Upon the occurrence of a fundamental change (as defined in the Indenture) (but not, at the Company’s election, a public acquirer change of control (as defined in the Indenture)), holders of the Convertible Notes may require the Company to repurchase for cash all or a portion of their Convertible Notes at a fundamental change repurchase price equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus accrued and unpaid interest to, but excluding, the fundamental change repurchase date . Except as described below, the Company may not redeem the Convertible Notes prior to August 5, 2022. If the NBIC Acquisition had not been consummated for any reason by June 8, 2018, or if the acquisition agreement relating to the NBIC Acquisition had terminated for any reason (other than by consummation of the NBIC Acquisition), the Company could redeem all, but not less than all, of the outstanding Convertible Notes for cash on a redemption date to occur on or prior to August 31, 2018 for a redemption price for each $1,000 principal amount of Convertible Notes equal to the sum of (i) $1,010, (ii) accrued and unpaid interest on such Convertible Notes to, but excluding, the redemption date and (iii) 75% of the excess, if any, of the redemption conversion value (as defined in the Indenture) over the initial conversion value (as defined in the Indenture). On or after August 5, 2022 but prior to February 1, 2037, the Company may redeem for cash all or any portion of the Convertible Notes, at the Company’s option, at a redemption price equal to 100% of the principal amount of the Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. No sinking fund is provided for the Convertible Notes, which means that the Company is not required to redeem or retire the Convertible Notes periodically. Holders of the Convertible Notes will be able to cause the Company to repurchase their Convertible Notes for cash on any of August 1, 2022, August 1, 2027 and August 1, 2032, in each case at 100% of their principal amount, plus accrued and unpaid interest to, but excluding, the relevant repurchase date. The Indenture contains customary terms and covenants and events of default. If an Event of Default (as defined in the Indenture) occurs and is continuing, the Trustee by notice to the Company, or the holders of at least 25% in aggregate principal amount of the Convertible Notes then outstanding by notice to the Company and the Trustee, may declare 100% of the principal of, and accrued and unpaid interest, if any, on, all the Convertible Notes to be immediately due and payable. In the case of certain events of bankruptcy, insolvency or reorganization (as set forth in the Indenture) with respect to the Company, 100% of the principal of, and accrued and unpaid interest, if any, on, the Convertible Notes will automatically become immediately due and payable. The trading price of the underlying Secured Note as of December 31, 2017 was approximately 1.07 of par value. Debt issuance costs are capitalized and presented as a deduction from the carrying value of the debt. The debt discount and issuance costs are amortized to interest expense over the expected life of the underlying debt of 5 years. As there are offsetting puts and calls on the debt security in August 2022 at par, it will be economically beneficial for one party, either the company or the noteholders to exercise their option. The Company records the fair value of these derivatives on its balance sheet at fair value with changes in the values of these derivatives reflected in the consolidated statement of operations. The embedded derivatives are valued using the Convertible Lattice model at issuance and at the end of each quarter and marked to fair value with corresponding adjustment as “gain or loss” on change in fair values included in Other Non-Operating expense in the consolidated statements of operations. On December 1, 2017, the Company held a Special Meeting of Stockholders, at which the Company’s stockholders approved, as required by Rule 312 of the New York Stock Exchange Listed Company Manual, the issuance of the Company’s common stock upon conversion of the Convertible Notes. Pursuant to the approval, the Company has the ability to settle the conversion option in shares of common stock, cash or a combination thereof. Upon conversion of the Convertible Notes, the Company intends to pay cash in respect of only the principal amount of the Convertible Notes being converted or (if lower) the conversion value thereof, and to settle any amounts in excess thereof in cash, shares of common stock or a combination thereof, at the Company’s election. Prior to receipt of stockholder’s approval, the Company recorded the fair value of the derivatives liability on its balance sheet at fair value with changes in the fair values reflected in the consolidated state of operations. Beginning December 1, 2017, the conversion option of the Convertible Notes qualifies for equity classification and will no longer be accounted for as a separate derivative instruments liability in accordance with applicable U.S. GAAP guidance. The Company valued the embedded derivative and recorded additional paid-in-capital of $51.6 million. In connection with the change in fair value, the Company recognized a fair value change for the year ended December 31, 2017 of $41.0 million as non-operating expense in the statement of operations. The valuation of the embedded derivatives within the convertible note was completed with the following assumptions: Assumptions August 10, 2017 September 30, 2017 December 1, 2017 Dividend yield 2.13 % 1.82 % 1.33 % Yield 10.2 % 8.5 % 8.5 % Risk-free rate 2.55 % 2.63 % 2.58 % Volatility 25.8 % 20.5 % 20.0 % Remaining Term (years) 4.98 4.84 4.67 Stock price $ 11.26 $ 13.21 $ 18.00 The following table summarizes the derivative liability activity for the year ended December 31, 2017: Description Derivative Liabilities (In thousands) Fair value at issuance $ 16,838 Change fair value 41,013 Conversion option related to extinguishment of notes 6,211 Carrying value at December 31, 2017 $ 51,641 Debt Extinguishment Between October 2, 2017 and November 14, 2017, the Company, through its subsidiary Heritage P&C, reacquired $21.1 million of its outstanding Convertible Notes in the open market at a premium for $25.2 million. In accordance with purchase agreement governing the Company’s offer and sale of the convertible debt, the Company or its affiliates are prohibited from reselling the notes once acquired. The repurchased Convertible Notes hold no registrations rights. In accordance with ASC 470 “ Debt Based on the reacquisition of the Convertible Notes by the Company, through Heritage P&C, the Company should derecognize the related debt and conversion option liability. Upon extinguishment, the Company performed a discounted cash flow (“DCF”) analysis for each transaction based on its date and principal amount, leveraging market debt yield data as of each trade date to estimate the cost of the debt. The Company removed the net debt of $17.7 million and liability derivative at the carrying amount in the amount of $6.2 million. The extinguishment of debt was measured at the then-current fair value at the time of purchase, with any difference recorded as a gain or loss on the extinguishment of the two separate accounting liabilities. The Company recognized a net loss of $1.2 million on extinguishment. Mortgage Loan On October 30, 2017, the Company and its subsidiary, Skye Lane Properties LLC (“Skye Lane”), jointly obtained a commercial real estate mortgage loan in the amount of $12.7 million which is secured by a first mortgage on the real property owned by Skye Lane. The term of the loan shall end on October 30, 2027. The loan shall bear interest at an initial interest rate equal to 4.95% per annum. On October 30, 2022, the interest rate shall adjust to an interest rate equal to the annualized interest rate of United States 5-year Treasury Notes as reported by the Federal Reserve on a weekly average basis plus 3.10%. The loan is payable monthly of principal and interest based upon a 25-year amortization. As of December 31, 2017, the Company paid $54,000 for interest expense and $43,000 for principal. The following table summarizes the Company’s long-term debt (in thousands): December 31, 2017 December 31, 2016 Convertible debt $ 115,624 $ — Mortgage loan 12,658 — Senior Note payable 79,500 79,500 Total principal amount $ 207,782 $ 79,500 Less: unamortized discount and issuance costs Debt discount and issuance cost on convertible debt 17,605 — Debt issuance cost on senior note payable 5,772 6,595 Total long-term debt $ 184,405 $ 72,905 Expected annual principal payments due by the Company under the long-term debt agreements is as follows: Year Amount (In thousands) 2018 $ 2,210 2019 7,742 2020 7,036 2021 6,403 2022 5,831 Thereafter 178,560 $ 207,782

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Note 12. Income Taxes The following table summarizes the provision for income taxes: For the Year Ended December 31, 2017 2016 2015 (In thousands) Federal: Current $ (24,380 ) $ 16,575 $ 48,524 Deferred 18,383 2,735 970 Provision for Federal income tax (benefit) expense (5,997 ) 19,310 49,494 State: Current (20 ) 2,893 8,238 Deferred 1,244 335 46 Provision for State income tax expense 1,224 3,228 8,284 (Benefit) provision for income taxes $ (4,773 ) $ 22,538 $ 57,778 The income tax (benefit) expense differs from the amounts computed by applying the U.S. federal income tax rate of 35% to pretax income as a result of the following (in thousands): For the Year Ended December 31, 2017 2016 2015 Expected income tax expense at federal rate 35.0 % 35.0 % 35.0 % State tax expense (22.8 )% 3.7 % 3.6 % Permanent items (2.3 )% 0.2 % (0.1 )% Non-deductible conversion option liability (255.0 )% — — Non-deductible stock compensation (26.0 )% 0.1 % — Tax exempt interest 27.0 % (2.1 )% (0.6 )% Non-deductible acquisition costs (15.2 )% 0.2 % 0.1 % Executive compensation 162(m) (11.5 )% 1.1 % — Political contributions (7.8 )% 0.7 % 0.1 % Tax rate change 362.3 % — — Other (2.7 )% 1.1 % 0.4 % Reported income tax expense 81.0 % 40.0 % 38.5 % The effective income tax rate differs from the statutory income tax rate in 2017 primarily due to the non-deductible stock option, non-deductible valuation of the conversion option liability (refer to Note 11 - Long Term Debt The Tax Act was signed into law on December 22, 2017 and contains several key provisions that impact the Company's business, including the reduction of the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018, the reduction in the amount of executive compensation that could qualify as a tax deduction, and a change in how property and casualty taxpayers discount loss reserves. Under current accounting guidance, the effects of changes in tax rates and laws are recognized in the period in which the new legislation is enacted. However, due to the timing of the enactment of the Tax Act and its proximity to December 31, 2017, the SEC issued SAB 118 which provides a framework for companies to account for uncertainties in applying the provisions of the Tax Act. SAB 118 allows companies to record a provisional amount in situations where a company does not have the necessary information available but can make a reasonable estimate. In situations where companies cannot make a reasonable estimate due to various factors, including lack of information, a provisional amount is not recorded. Instead, companies will continue to apply current accounting guidance based on the provision of the tax laws that were in effect immediately prior to the Tax Act being enacted. The measurement period, as defined in SAB 118 for the Tax Act, begins on the enactment date of the Tax Act and ends when a company has obtained, prepared and analyzed the information that was needed in order to complete the accounting requirements under current accounting guidance. However, under no circumstances will the measurement period extend beyond one year from the enactment date of the Tax Act. The Company has completed its accounting for the impact of the effective tax rate change from 35% to 21%. As a result, the Company recorded a $21.3 million benefit to operations for the reduction in the deferred tax liability as of December 22, 2017. In addition, due to the lack of guidance, the Company was unable to provide a provisional estimate for the impacts of computing property and casualty reserves. The Tax Act changes the way that companies calculate their insurance reserves for tax purposes, including revaluing those tax basis liabilities as of January 1, 2018, based on a methodology and discount factors that have not been published. Any resulting transitional deferred tax liability and offsetting increase in the Company’s property and casualty reserves will completely offset and will have no impact on the effective tax rate. In accordance with SAB 118, the reserve transitional deferred tax liability (and offsetting adjustment to the related deferred tax assets) and any other changes in deferred taxes resulting from clarification and interpretation of the Tax Act provided during 2018 will be recorded in the period in which the guidance is published. For the Year Ended December 31, 2017 2016 Deferred tax assets: (In thousands) Unearned premiums $ 12,488 $ 17,209 Unearned commission 11,987 — Net operating loss 4,727 — Tax-related discount on loss reserve 1,250 1,829 Unrealized loss — 3,113 Stock-based compensation — 1,604 Prepaid expenses 1,950 1,482 Other 331 312 Total deferred tax asset 32,733 25,549 Deferred tax liabilities: Deferred acquisition costs 9,775 16,377 Prepaid expenses 27,568 — Unrealized gain 30 — Property and equipment — 355 Note discount 3,818 — Basis in purchased investments 335 1,697 Basis in purchased intangibles 24,250 9,791 Other 1,290 332 Total deferred tax liabilities 67,066 28,552 Net deferred tax liability $ (34,333 ) $ (3,003 ) As of December 31, 2017, the Company has net operating loss carryforwards for federal and state income tax purposes of $13.1 million and $76.2 million, respectively. The losses will expire between 2026 and 2037. In addition, the Company has a $300 thousand capital loss carryforward which will expire in 2018. In assessing the net carrying The statute of limitations related to our federal and state income tax returns remains open from our filings for 2014 through 2016. For the 2014 tax year, the federal income tax return was examined by the tax authority resulting in no material adjustment. Currently, no taxing authorities are examining any of our federal or state income tax returns. The reinsurance affiliate, which is based in Bermuda, made an irrevocable election under section 953(d) of the U.S. Internal Revenue Code of 1986, as amended, to be treated as a domestic insurance company for U.S. Federal income tax purposes. As a result of this election, our reinsurance subsidiary is subject to United States income tax as if it were a U.S. corporation. As of December 31, 2017, the Company had no uncertain tax positions or unrecognized tax benefits that, if recognized, would impact the effective income tax rate.

Statutory Accounting and Regula

Statutory Accounting and Regulations	12 Months Ended
	Dec. 31, 2017
Text Block [Abstract]
Statutory Accounting and Regulations	Note 13. Statutory Accounting and Regulations State laws and regulations, as well as national regulatory agency requirements, govern the operations of all insurers such as our insurance subsidiaries. The various laws and regulations require that insurers maintain minimum amounts of statutory surplus and risk-based capital; restrict insurers’ ability to pay dividends; restrict the allowable investment types and investment mixes, and subject the Company’s insurers to assessments. The Company’s insurance subsidiaries are required to file with state insurance regulatory authorities an “Annual Statement” which reports, among other items, net income and surplus as regards policyholders, which is called stockholder’s equity under GAAP. Combined results of the Company’s insurance subsidiaries reported statutory net income of $50.6 million and $567,000 for the years ended December 31, 2017 and 2016, respectively. The Company’s insurance subsidiaries must maintain capital and surplus ratios or balances as determined by the regulatory authority of the states in which they are domiciled. Heritage P&C is required to maintain capital and surplus equal to the greater of $15 million or 10% of their respective liabilities. Zephyr is required to maintain a deposit of $750,000 in a federally insured financial institution. NBIC is required to maintain capital and surplus of $3.0 million. The combined statutory surplus for Heritage P&C, Zephyr, and NBIC was $376.3 million at December 31, 2017. The combined statutory surplus for Heritage P&C and Zephyr was $276.1 million at December 31, 2016. State laws also require the Company’s insurance subsidiaries to adhere to prescribed premium-to-capital surplus ratios, with which the Company’s insurance affiliates are complying. At December 31, 2017, our insurance subsidiaries met the financial and regulatory requirements of the states in which they do business. The legislatures of the states of domicile of our insurance affiliates have adopted the National Association of Insurance Commissioners (“NAIC”) recommendations with regard to expansion of the regulation of insurers to include non-insurance entity affiliates. Specifically, the new law permits the state insurance regulators to examine affiliated entities within an insurance holding company system in order to ascertain the financial condition of the insurer. The law also provides for certain disclosures regarding enterprise risk, which are satisfied by the provision of related information filed with the SEC. The NAIC published risk-based capital guidelines for insurance companies that are designed to assess capital adequacy and to raise the level of protection that statutory surplus provides for policy holders. Most states, including Florida, Hawaii, and Rhode Island, have enacted the NAIC guidelines as statutory requirements, and insurers having less statutory surplus than required will be subject to varying degrees of regulatory action, depending on the level of capital inadequacy. State insurance regulatory authorities could require an insurer to cease operations in the event the insurer fails to maintain the required statutory capital. The level of required risk-based capital (“RBC”) is calculated and reported annually. There are five outcomes to the RBC calculation set forth by the NAIC which are as follows: 1. No Action Level—If RBC is greater than 200%, no further action is required. 2. Company Action Level—If RBC is between 150%-200%, the insurer must prepare a report to the regulator outlining a comprehensive financial plan that identifies conditions that contributed to the insurer’s financial condition and proposes corrective actions. 3. Regulatory Action Level—If RBC is between 100%-150%, the state insurance commissioner is required to perform any examinations or analyses to the insurer’s business and operations that he or she deems necessary as well as issuing appropriate corrective orders. 4. Authorized Control Level—If RBC is between 70%-100%, this is the first point that the regulator may take control of the insurer even if the insurer is still technically solvent and is in addition to all the remedies available at the higher action levels. 5. Mandatory Control Level—If RBC is less than 70%, the regulator is required to take steps to place the insurer under its control regardless of the level of capital and surplus. At December 31, 2017, the ratio of adjusted capital to authorized control level risk based capital for each of our insurance company subsidiaries was above 300%. State laws for Florida, Hawaii, and Rhode Island permit an insurer to pay dividends or make distributions out of that part of statutory surplus derived from net operating profit and net realized capital gains. The laws provide calculations to determine the amount of dividends or distributions that can be made without the prior approval of the insurance regulatory authority and the amount of dividends or distributions that would require prior approval of the insurance regulatory authority. Statutory risk-based capital requirements may further restrict our insurance subsidiaries ability to pay dividends or make distributions if the amount of the intended dividend or distribution would cause statutory surplus to fall below minimum risk-based capital requirements. However, the consent order authorizing our commencement of operations precludes us from paying dividends without the prior approval of FLOIR until July 31, 2017. State insurance laws limits an insurer’s investment in equity instruments and also restricts investments in medium to low quality debt instruments. The Company’s insurance affiliates were in compliance with all investment restrictions at December 31, 2017 and 2016. Governmental agencies or certain quasi-governmental entities can levy assessments upon the Company in the states in which the Company writes policies. See Note 1 Basis of Presentation, Nature of Business and Significant Accounting Policies and Practices” The Company reported its insurance subsidiaries’ assets, liabilities and results of operations in accordance with GAAP, which varies from statutory accounting principles prescribed or permitted by state laws and regulations, as well as by general industry practices. The following items are principal differences between statutory accounting and GAAP: • Statutory accounting requires that the Company excluded certain assets, called non-admitted assets, from the balance sheet. • Statutory accounting requires the Company to expense policy acquisition costs when incurred, while GAAP allows the Company to defer and amortize policy acquisition costs over the estimated life of the policies. • Statutory accounting dictates how much of a deferred income tax asset the Company can admit on a statutory balance sheet. • Statutory accounting requires that the Company record certain investments at cost or amortized cost, while the Company records other investments at fair value; however, GAAP requires that we record all available for sale investments at fair value. • Statutory accounting requires that surplus notes, also known as surplus debentures, be recorded in statutory surplus, while GAAP requires the Company to record surplus notes as a liability. • Statutory accounting allows bonds to be carried at amortized cost or fair value based on the rating received from the Securities Valuation Office of the NAIC, while they are recorded at fair value for GAAP if designated as available for sale. • Statutory accounting allows ceding commission income to be recognized when written if the cost of acquiring and renewing the associated business exceeds the ceding commissions, but under GAAP such income is deferred and recognized over the coverage period. • Statutory accounting requires that unearned premiums and loss reserves be presented net of related reinsurance rather than on a gross basis under GAAP. • Statutory accounting requires a provision for reinsurance liability be established for reinsurance recoverable on paid losses aged over ninety days and for unsecured amounts recoverable from unauthorized reinsurers. Under GAAP there is no charge for uncollateralized amounts ceded to a company not licensed in the insurance affiliate’s domiciliary state and a reserve for uncollectable reinsurance is charged through earnings rather than surplus or equity. • Statutory accounting requires an additional admissibility test outlined in Statements on Statutory Accounting Principles, No. 101 and the change in deferred income tax is reported directly in capital and surplus, rather than being reported as a component of income tax expense under GAAP. The table below reconciles the Company’s consolidated GAAP net (loss) income to statutory net income of its insurance subsidiaries (in thousands): For the Year Ended December 31, 2017 2016 2015 Consolidated GAAP net (loss) income $ (1,119 ) $ 33,865 $ 92,512 Increase (decrease) due to: Deferred income taxes 32,644 6,069 1,755 Deferred acquisition costs 1,101 (7,979 ) (10,430 ) Surplus note interest (4 ) — (347 ) Non-statutory subsidiaries 5,410 (32,874 ) (36,569 ) Investment basis difference 446 540 — Pre-acquisition income 20,839 3,755 — Equity compensation (2,408 ) (2,107 ) (1,074 ) Convertible notes 1,051 — — Commission revenue (6,700 ) — — Allowance for doubtful accounts — — (250 ) Other (709 ) (702 ) — Statutory net income of insurance subsidiaries $ 50,551 $ 567 $ 45,597 The Company’s reinsurance subsidiary, Osprey, which was incorporated on April 23, 2013, is licensed as a Class 3a Insurer under The Bermuda Insurance Act 1978 and related regulations. Osprey is required to maintain statutory capital and surplus of at least $1.0 million and maintain liquid resources or have access to liquid resources equal to its maximum obligation for which it is responsible under the terms of any reinsurance arrangement to which it is a party. Osprey maintains sufficient collateral comply with regulatory requirements as of December 31, 2017. Bermuda’s standard for financial statement reporting is U.S. GAAP.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 14. Commitments and Contingencies The Company is involved in claims-related legal actions arising in the ordinary course of business. The Company accrues amounts resulting from claims-related legal actions in unpaid losses and loss adjustment expenses during the period that it determines an unfavorable outcome becomes probable and it can estimate the amounts. Management makes revisions to its estimates based on its analysis of subsequent information that the Company receives regarding various factors, including: (i) per claim information; (ii) company and industry historical loss experience; (iii) judicial decisions and legal developments in the awarding of damages; and (iv) trends in general economic conditions, including the effects of inflation. When determinable, the Company discloses the range of possible losses in excess of those accrued and for reasonably possible losses.

Accounts Payable and Other Liab

Accounts Payable and Other Liabilities	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Accounts Payable and Other Liabilities	Note 15. Accounts Payable and Other Liabilities Other liabilities consist of the following as of December 31, 2017 and December 31, 2016: Description December 31, 2017 December 31, 2016 (In thousands) Deferred ceding commission $ 51,109 $ — Outstanding claim checks 79,666 — Accounts payable and other payables 17,948 6,804 Accrued interest and issuance costs 3,117 5,704 Accrued dividends — 1,784 Escrow 1,210 1,210 Premium tax 3,660 — Other liabilities 218 — Commission payables 12,609 6,179 Total other liabilities $ 169,537 $ 21,681

Accrued Bonus Compensation

Accrued Bonus Compensation	12 Months Ended
	Dec. 31, 2017
Compensation Related Costs [Abstract]
Accrued Bonus Compensation	Note 16. Accrued Bonus Compensation For the year ended December 31, 2017, the Company recognized employee bonus compensation expense of approximately $6.9 million, which the Company paid out in cash approximately $0.9 million during 2017. For the year of December 31, 2016, the Company recognized employee bonus compensation expense of approximately $4.4, which the Company paid out in cash of approximately $0.8 million for 2016. For the year ended December 31, 2015, the Company recognized employee bonus compensation expense of approximately $14.1 million, which the Company paid out in cash approximately $12.1 million as of December 31, 2015 and the remainder was paid in 2016.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Note 17. Related Party Transactions The Company has been party to various related party transactions involving certain of its officers, directors and significant stockholders as set forth below. The Company has entered into these arrangements without obligation to continue its effect in the future and the associated expense was immaterial to its results of operations or financial position as of December 31, 2017, 2016 and 2015. • In January 2017, the Company entered into a consulting agreement with Mrs. Shannon Lucas, the wife of the Chairman and CEO, in which she agreed to provide consulting services related to the Company’s catastrophe reinsurance and risk management program at a rate of $400 per hour. The consulting agreement has no specific term and either party may terminate the agreement upon providing written notice. Additionally, she serves as a director of Heritage P&C with an annual compensation of $75,000. For the year ended December 31, 2017, the Company paid consulting fees to Ms. Lucas of approximately $440,000.

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	Note 18. Employee Benefit Plan All the Company personnel are employed by one of our insurance company subsidiaries. Heritage P&C provides a 401(k) plan for its employees. The Company contributes 3% of employees’ salary, up to the maximum allowable contribution, regardless of the employees’ level of participation in the plan. For the years ended December 31, 2017 and 2016, the Company’s contributions to the plan on behalf of the participating employees were $815,000 and $685,000 respectively. Heritage P&C provides for its employees a partially self-insured healthcare plan and benefits. For the years ended December 31, 2017 and 2016, the Company incurred medical premium costs in the aggregate of $3.0 million and $2.4 million, respectively. The Company also recorded approximately $249,000 as unpaid claims as of December 31, 2017. A stop loss reinsurance policy caps the maximum loss that could be incurred by the Company under the self-insured plan. The Company’s stop loss coverage per employee is $60,000 for which any excess cost would be covered by the reinsurer. There is an aggregate limit for losses of $1.5 million which would provide up to $1 million of coverage. Any excess of the $1.5 million retention and the $1 million of aggregate coverage would be borne by the Company. The aggregate stop loss commences once our expenses exceed 125% of the annual aggregate expected claims. Both Zephyr and NBIC provide regular full insurance plans to their respective employees. NBIC provides a 401(k) plan for its employees who elect to participate and matches the contributions up to a maximum of 3%. Employer contributions vest 20% each year until fully vested after 5 years.

Equity

Equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Equity	Note 19. Equity The total amount of authorized capital stock consists of 50,000,000 shares of common stock and 5,000,000 shares of preferred stock. As of December 31, 2017, the Company had 25,885,004 shares of common stock outstanding, 7,099,597 treasury shares of common stock and 675,000 unvested restricted common stock issued reflecting total paid-in capital of $294.8 million as of such date. Common Stock Holders of common stock are entitled to one vote for each share held on all matters subject to a vote of stockholders, subject to the rights of holders of any outstanding preferred stock. Accordingly, holders of a majority of the shares of common stock entitled to vote in any election of directors may elect all of the directors standing for election, subject to the rights of holders of any outstanding preferred stock. Holders of common stock will be entitled to receive ratably any dividends that the board of directors may declare out of funds legally available therefor, subject to any preferential dividend rights of outstanding preferred stock. Upon the Company’s liquidation, dissolution or winding up, the holders of common stock will be entitled to receive ratably its net assets available after the payment of all debts and other liabilities and subject to the prior rights of holders of any outstanding preferred stock. Holders of common stock have no preemptive, subscription, redemption or conversion rights. There is no redemption or sinking fund provisions applicable to the common stock. All outstanding shares of the Company’s capital stock (excluding restricted stock) are fully paid and nonassessable. Stock Repurchase Program On September 14, 2015, the Company announced that the Company’s Board of Directors, authorized a stock repurchase program authorizing the Company to repurchase up to $20 million of the Company’s common stock. On May 4, 2016, the Board of Directors authorized an additional stock repurchase of up to $50 million of the Company’s common stock through December 31, 2017. For the year ended December 31, 2017 the Company repurchased an aggregate of 1,787,870 shares of the Company’s stock in open market transactions for $21.6 million. On December 31, 2017, the plan expired. In connection with the issuance of the Convertible Notes as described in Note 11 Long-Term Debt Dividends For the year ended December 31, 2017, we recorded quarterly cash dividends of approximately $6.5 million as follows: Quarter Ended March 2, 2017 May 2, 2017 August 8, 2017 October 31, 2017 Cash dividend per common share $ 0.06 $ 0.06 $ 0.06 $ 0.06 Total cash dividends paid $ 1,784,426 $ 1,743,385 $ 1,478,333 $ 1,458,787 Record date March 15, 2017 June 15, 2017 September 15, 2017 November 17, 2017 Payment date April 4, 2017 July 5, 2017 October 2, 2017 December 15, 2017 Cash dividends declared on our outstanding weighted average number of basic common shares for the periods presented were as follows: For the Years Ended December 31, 2017 2016 Cash dividends per common share $ 0.30 $ 0.23

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	Note 20. Stock-Based Compensation The Company has adopted the Heritage Insurance Holdings, Inc., Omnibus Incentive Plan (the “Plan”) effective on May 22, 2014. The Plan authorized 2,981,737 shares of common stock for issuance under the Plan for future grants. As of December 31, 2017, all unvested shares have been forfeited. At December 31, 2017 and 2016, there were 1,125,243 and 170,814 shares available for grant under the Plan, respectively. The Company recognizes compensation expense under ASC 718 for its stock-based payments based on the fair value of the awards. The Company grants stock options at exercise prices equal to the fair market value of the Company’s stock on the dates the options are granted. The options have a maximum term of ten-years from the date of grant and vest primarily in equal annual installments over a range of one to five-year periods following the date of grant for employee options. If a participant’s employment relationship ends, the participant’s vested awards will remain exercisable for the shorter of a period of 30 days or the period ending on the latest date on which such award could have been exercisable. The fair value of each option grant is separately estimated for each grant date. The fair value of each option is amortized into compensation expense on a straight-line basis between the grant date for the award and each vesting date. The Company estimates the fair value of all stock option awards as of the date of the grant by applying the Black-Scholes-Merton multiple-option pricing valuation model. The application of this valuation model involves assumptions that are judgmental and highly sensitive in the determination of compensation expense. Stock Options On September 24, 2014, the Company granted options to purchase 359,000 shares to certain employees and directors. No stock options were granted in the years ending December 31, 2015 and 2016. These options were awarded with the strike price set at the fair market value at the grant date, and vested on March 15, 2015 with an expiration date of September 24, 2017. The fair value of each option grant, which was $2.70 per option granted in 2014, was estimated on the date of grant using the Black-Scholes option-pricing model. The fair value of options vested during the year ended December 31, 2014 was $2.5 million. On December 2, 2014, the Company granted options to purchase 1,326,923 shares to certain employees and directors. The employee options were awarded with the strike price set at the fair market value at the grant date, and vested at 50 percent upon grant and 50 percent on April 30, 2015 with an expiration date of December 2, 2017. The directors’ options were awarded with the strike price set at the fair market value at the grant date, and vest quarterly commencing on January 1, 2015 with an expiration date of December 2, 2017. The fair value of each option grant, which ranged from $3.07 to $3.54 per option granted in 2014, was estimated on the date of grant using the Black-Scholes option-pricing model. The fair value of options that vested as of December 31, 2015 was $2.7 million. Stock option activity for the three years ended December 31, 2017, 2016 and 2015 is as follows: Shares Weighted-Average Grant Date Fair Value Balance at December 31, 2014 1,685,923 $ 2.79 Granted — Exercised (536,000 ) $ 4.29 Expired — Balance at December 31, 2015 1,149,923 $ 2.99 Granted — Exercised — Expired — Balance at December 31, 2016 1,149,923 $ 2.99 Granted — Exercised (24,680 ) $ 3.07 Expired (1,125,243 ) $ 2.99 Balance at December 31, 2017 — Vested and exercisable as of December 31, 2017 — No compensation expense was recognized for stock options granted above during the years December 31, 2017 and 2016. The Company has recognized $1.9 million of compensation expense during the year ended December 31, 2015. Restricted Stock The Company has also granted shares of its common stock subject to certain restrictions under the Plan. Restricted stock awards granted to employee’s vest in equal installments generally over a five-year period from the grant date subject to the recipient’s continued employment. The fair value of restricted stock awards is estimated by the market price at the date of grant and amortized on a straight-line basis to expense over the period of vesting. Recipients of restricted stock awards have the right to receive dividends. No restricted stock was granted during the year ended December 31, 2017. Restricted stock activity for the three years ended December 31, 2017, 2016 and 2015 is as follows: Weighted-Average Grant-Date Fair Number of shares Value per Share Non-vested, at December 31, 2014 — — Granted 1,125,000 $ 21.40 Vested — — Canceled and surrendered — — Non-vested, at December 31, 2015 1,125,000 $ 21.40 Granted — — Vested (158,365 ) $ 14.67 Canceled and surrendered (66,635 ) $ 14.67 Non-vested, at December 31, 2016 900,000 $ 18.42 Granted — — Vested (137,935 ) $ 16.53 Canceled and surrendered (87,065 ) $ 17.41 Non-vested, at December 31, 2017 675,000 $ 21.40 Awards are being amortized to expense over the five years vesting period. Relating to the restricted stock the Company recognized $4.8 million, $3.8 million and $749,000 of compensation expense for the years ended December 31, 2017, 2016 and 2015, respectively. At December 31, 2017, there was approximately $13.7 million, representing unrecognized compensation expense related to the non-vested restricted stock. The Company expects to recognize the remaining compensation expense over a weighted average period of 1.9 years. The following table summarizes information about deferred tax benefits recognized and tax benefits realized from restricted stock awards and related paid dividends, and the fair value of vested restricted stock for the years ended December 31, 2017, 2016 and 2015, respectively. For the Year Ended December 31, 2017 2016 2015 Deferred tax benefit recognized $ — $ — $ 76 Tax benefit realized for restricted stock and paid dividends — — 357 Fair value of vested restricted stock 3,796 3,301 —

Condensed Financial Information

Condensed Financial Information of Heritage Insurance Holdings, Inc.	12 Months Ended
	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Condensed Financial Information of Registrant	Note 21. Condensed Financial Information of Heritage Insurance Holdings, Inc. The following summarizes the major categories of Heritage Insurance Holdings, Inc.’s financial statements: BALANCE SHEET As of December 31, 2017 2016 (In thousands) ASSETS Fixed maturity securities, available for sale, at fair value $ — $ 77,922 Cash and cash equivalents 16,249 7,368 Investment in and advances to subsidiaries 584,983 334,983 Other assets 1,294 19,055 Total Assets $ 602,526 $ 439,328 LIABILITIES AND STOCKHOLDERS' EQUITY Other liabilities 222,710 81,369 Total Liabilities $ 222,710 $ 81,369 Total Stockholders' Equity $ 379,816 $ 357,959 Total Liabilities and Stockholders' Equity $ 602,526 $ 439,328 STATEMENT OF OPERATIONS For the Year Ended December 31, 2017 2016 2015 (In thousands, except share and per share amounts) Revenue: Other revenue $ 1,949 $ 1,403 $ 1,129 Total revenue 1,949 1,403 1,129 Expenses: General and administrative expense 17,792 11,558 9,036 Amortization of debt issuance cost 2,314 41 — Interest expense, net 11,158 321 — Other non-operating expense, net 41,013 — — Total expenses $ 72,277 $ 11,920 $ 9,036 Loss before income taxes and equity in net income of subsidiaries (70,328 ) (10,517 ) (7,907 ) Benefit from income taxes (6,120 ) (2,035 ) (2,227 ) Loss before equity in net income of subsidiaries (64,208 ) (8,482 ) (5,680 ) Equity in net income of subsidiaries — — 98,192 Net (loss) income $ (64,208 ) $ (8,482 ) $ 92,512 STATEMENT OF CASH FLOWS For the Year Ended December 31, 2017 2016 2015 (In thousands) Net cash provided by (used in) operating activities $ 27,154 $ (6,045 ) $ 7,196 Investing Activities Purchases of investment available for sale 78,213 (77,910 ) — Dividends received from subsidiaries 57,575 85,096 21,400 Acquisition of a business (210,000 ) Investments and advances to subsidiaries — (74,361 ) (32,400 ) Net cash used in investing activities (47,058 ) (73,220 ) (3,804 ) Financing Activities Proceeds from exercise of stock options and warrants 417 — 8,900 Proceeds from issuance of note payable, net of issuance costs 114,335 77,910 — Proceeds from mortgage loan 12,658 — — Excess tax (expense) benefit on stock-based compensation — (739 ) 739 Shares tendered for income tax withholdings (1,599 ) (977 ) — Purchase of treasury stock (61,623 ) (25,562 ) — Dividends (8,249 ) (6,806 ) — Net cash provided by financing activities 55,939 43,826 9,639 Increase (decrease) in cash and cash equivalents 8,881 (29,394 ) 5,835 Cash and cash equivalents, beginning of period 7,368 36,762 30,927 Cash and cash equivalents, end of year $ 16,249 $ 7,368 $ 36,762

Quarterly Results of Operations

Quarterly Results of Operations (Unaudited) - Summary of Quarterly Consolidated Results of Operations	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (Unaudited) - Summary of Quarterly Consolidated Results of Operations	Note 22. Quarterly Results for 2017 and 2016 (unaudited) The following table provides a summary of unaudited quarterly results for the periods presented (in thousands, except per share data): For the year ended December 31, 2017 First Quarter Second Quarter Third Quarter Fourth Quarter Net premiums earned $ 92,176 $ 90,452 $ 95,208 $ 101,728 Investment income $ 2,502 $ 2,973 $ 2,735 $ 3,122 Total revenues $ 99,293 $ 96,938 $ 101,774 $ 108,618 Total operating expenses $ 87,403 $ 83,876 $ 100,361 $ 85,448 Operating income $ 11,890 $ 13,062 $ 1,413 $ 23,170 Net income (loss) $ 5,983 $ 6,642 $ (8,696 ) $ (5,048 ) Basic earnings per share $ 0.21 $ 0.23 $ (0.34 ) $ (0.18 ) Diluted earnings per share $ 0.21 $ 0.23 $ (0.34 ) $ (0.18 ) For the year ended December 31, 2016 First Quarter Second Quarter Third Quarter Fourth Quarter Net premiums earned $ 106,342 $ 108,918 $ 101,555 $ 94,906 Investment income $ 2,037 $ 2,223 $ 2,326 $ 2,595 Total revenues $ 111,565 $ 115,281 $ 109,306 $ 102,806 Total expenses $ 99,525 $ 85,524 $ 90,694 $ 106,450 Operating income $ 12,040 $ 29,757 $ 18,612 $ (3,644 ) Net income (loss) $ 7,423 $ 18,368 $ 10,930 $ (2,856 ) Basic earnings per share $ 0.24 $ 0.62 $ 0.37 $ (0.09 ) Diluted earnings per share $ 0.24 $ 0.62 $ 0.37 $ (0.09 )

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Note 23. Subsequent Events On February 2, 2018, the Company awarded in aggregate 125,000 shares of its restricted common stock to two of its executive officers. The restricted stock vests in five equal annual installments of 25,000 commencing on January 1, 2019. The fair value of the restricted stock is $1.3 million and will be amortized ratably over the vesting period.

Basis of Presentation, Nature31

Basis of Presentation, Nature of Business and Significant Accounting Policies and Practices (Policies)	12 Months Ended
	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements include the accounts of Heritage Insurance Holdings, Inc. and its wholly-owned subsidiaries. The accompanying consolidated financial statements include the accounts of the Company and all other entities in which the Company has a controlling financial interest (none of which are variable interest entities). All intercompany accounts and transactions have been eliminated in consolidation. The Company qualifies as an “emerging growth company” as defined in Section 2(a)(19) of the Securities Act, as modified by the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). As a result, the Company is eligible for certain exemptions from various reporting requirements applicable to other public companies that are not emerging growth companies. The Company intends to continue to take advantage of some, but not all, of the exemptions available to emerging growth companies until such time that it is no longer an emerging growth company. The Company has, however, irrevocably elected not to take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards. As a result, the Company will comply with new or revised accounting standards on the relevant dates on which adoption of such standards is required for non-emerging growth companies.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with United States Generally Accepted Accounting Principles (“U.S. GAAP”) requires us to make estimates and assumptions about future events that affect the amounts reported in our consolidated financial statements and accompanying notes. We evaluate our estimates on an ongoing basis when updated information related to such estimates becomes available. We base our estimates on historical experience and information available to us at the time these estimates are made. Actual results could differ materially from these estimates.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company’s cash and cash equivalents include demand deposits with financial institutions and short-term, highly-liquid financial instruments with original maturities of three months or less when purchased. The carrying amounts reported in the consolidated balance sheets for interest bearing deposits approximate their fair value because of the short maturity of these financial instruments.
Restricted Cash	Restricted Cash As of December 31, 2017 and 2016, restricted cash was $20.8 million and $20.9 million, respectively. Heritage P&C holds approximately $18.3 million relating to a reinsurance agreement with an entity that issued catastrophe (“CAT”) bonds, as Heritage P&C is contractually required to deposit certain installments of reinsurance premiums into a trust account.
Investments	Investments The Company classifies all of its investments in fixed maturity securities and equity securities as available-for-sale, and reports them at fair value. Subsequent to its acquisition of available-for-sale securities, the Company records changes in value through the date of disposition as unrealized holding gains and losses, net of tax effects, and includes them as a component of other comprehensive income. The Company includes realized gains and losses, which it calculates using the specific-identification method for determining the cost of securities sold, in net income. The Company amortizes any premium or discount on fixed maturities over the remaining maturity period of the related securities using the effective interest method, and reports the amortization in net investment income. The Company recognizes dividends and interest income when earned. Quarterly, the Company performs an assessment of its investments to determine if any are “other-than-temporarily” impaired. An investment is impaired when the fair value of the investment declines to an amount less than the cost or amortized cost of that investment. As part of the assessment process, the Company determines whether the impairment is temporary or “other-than-temporary”. The Company bases its assessment on both quantitative criteria and qualitative information, considering a number of factors including, but not limited to: how long the security has been impaired; the amount of the impairment; whether, in the case of equity securities, the Company intends to hold, and have the ability to hold, the security for a period sufficient for us to recover our cost basis, or whether, in the case of debt securities and participations in mortgage loans, the Company intends to sell the investment or it is more likely than not that the Company will have to sell the investment before it recovers the amortized cost or cost; the financial condition and near-term prospects of the issuer; whether the issuer is current on contractually-obligated interest and principal payments; key corporate events pertaining to the issuer and whether the market decline was affected by macroeconomic conditions. If the Company were to determine that an equity security has incurred an “other-than-temporary” impairment, the Company would permanently reduce the cost of the security to fair value and recognize an impairment charge in its consolidated statements of operations and comprehensive income. If a debt security or participation in a commercial mortgage loan was impaired and the Company either intends to sell the investment or it is more likely than not that the Company will have to sell the investment before it is able to recover the amortized cost or cost, then the Company would record the full amount of the impairment in its consolidated statement of operations and other comprehensive income. A large portion of the Company’s investment portfolio consists of fixed maturity securities, which may be adversely affected by changes in interest rates as a result of governmental monetary policies, domestic and international economic and political conditions and other factors beyond its control. A rise in interest rates would decrease the net unrealized holding gains of our investment portfolio, offset by the Company’s ability to earn higher rates of return on funds reinvested. Conversely, a decline in interest rates would increase the net unrealized holding gains of our investment portfolio, offset by lower rates of return on funds reinvested. Accumulated other comprehensive income consists solely of unrealized gains and loss investments and is presented net of income tax.
Fair Value	Fair Value Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants (an exit price). When reporting the fair values of the Company’s financial instruments, the Company prioritizes those fair value measurements into one of three levels based on the nature of the inputs, as follows: • Level 1—Assets and liabilities with values based on unadjusted quoted prices for identical assets or liabilities in an active market that the Company is able to access; • Level 2—Asset and liabilities with values based on quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets in markets that are not active; or valuation models with inputs that are observable, directly or indirectly for substantially the term of the asset or liability. • Level 3—certain inputs are unobservable (supported by little or no market activity) and significant to the fair value measurement. Unobservable inputs reflect the Company’s best estimate of what hypothetical market participants would use to determine a transaction price for the asset or liability at the reporting date based on the best information available in the circumstances. The Company estimates the fair value of its investments using the closing prices on the last business day of the reporting period, obtained from active markets such as the NYSE and NASDAQ. For securities for which quoted prices in active markets are unavailable, the Company uses observable inputs such as quoted prices in inactive markets, quoted prices in active markets for similar instruments, benchmark interest rates, broker quotes and other relevant inputs. The Company does not have any investments in its portfolio which require the use of unobservable inputs. The Company’s estimate of fair value reflects the interest rate environment that existed as of the close of business on December 31, 2017. Changes in interest rates after December 31, 2017 may affect the fair value of the Company’s investments. The Company believes the carrying amounts of its cash and cash equivalents, accounts receivable, accounts payable, accrued expenses, and other current liabilities approximate their fair values at December 31, 2017 and 2016, due to the immediate or short-term maturity of these instruments. The Company’s non-financial assets, such as goodwill and property, plant and equipment are carried at cost until there are indicators of impairment, and are recorded at fair value only when an impairment charge is recognized. Long term debt is recorded at carrying value, see Note 11 – Long-Term Debt
Premiums	Premiums The Company records direct and assumed premiums written as revenue, net of ceded amounts, on a daily pro rata basis over the contract period of the related policies that are in force. For any portion of premiums not earned at the end of the reporting period, the Company records an unearned premium liability. In a one-time only transaction on September 1, 2017, the Company took over approximately 19,000 policies representing approximately $30.0 million in annualized premiums from Sawgrass Mutual Insurance Company. Premiums receivable represents amounts due from our policyholders for billed premiums and related policy fees. We perform a policy-level evaluation to determine the extent to which the balance of premiums receivable exceeds the balance of unearned premiums. We then age any resulting exposure based on the last date the policy was billed to the policyholder, and we establish an allowance for credit losses for any amounts outstanding for more than 90 days. When we receive payments on amounts previously charged off, we reduce bad debt expense in the period we receive the payment. Balances in premiums receivable and the associated allowance account are removed upon cancellation of the policy due to non-payment. We recorded no allowance for the years ended December 31, 2017 and 2016, respectively. Bad debt expense (recovery) related to uncollectible premiums was $0, $250,000 and $(250,000) for the years ended December 31, 2017, 2016 and 2015, respectively. When the Company receives premium payments from policyholders prior to the effective date of the related policy, the Company records an advance premiums liability. On the policy effective date, the Company reduces the advance premium liability and records the premiums as described above.
Policy Acquisition Costs	Policy Acquisition Costs The Company incurs policy acquisition costs that vary with, and are directly related to, the production of new business. Policy acquisition costs consist of the following four items: (i) commissions paid to outside agents at the time of policy issuance; (ii) policy administration fees paid to a third-party administrator at the time of policy issuance; (iii) premium taxes; and (iv) inspection fees. The Company capitalizes policy acquisition costs to the extent recoverable, then the Company amortizes those costs over the contract period of the related policy. At each reporting date, the Company determines whether it has a premium deficiency. A premium deficiency would result if the sum of the Company’s expected losses, deferred policy acquisition costs, and policy maintenance costs (such as costs to store records and costs incurred to collect premiums and pay commissions) exceeded the Company’s related unearned premiums plus investment income. Should the Company determine that a premium deficiency exists, the Company would write off the unrecoverable portion of deferred policy acquisition cost. NBIC earns ceding commission on its gross and net quota share reinsurance contracts. Our policy is to offset policy acquisition costs reported on the consolidated statement of operations and comprehensive income by ceding commission income. Ceding commission income is deferred and recognized over the quota share contract period. The amount and rate of ceding reinsurance commissions earned on the net quota share contract can slide within a prescribed minimum and maximum, depending on loss performance and how future losses develop.
Long-Lived Assets-Property and Equipment	Long-Lived Assets—Property and Equipment Property and equipment is stated at cost less accumulated depreciation and amortization. Depreciation is calculated on a straight-line basis over the estimated useful lives as follows: building—40 years; computer hardware and software 3—years; office and furniture equipment—3 to 7 years. Leasehold improvements are amortized over the shorter of the lease term or the asset’s useful life. Expenditures for improvements are capitalized to the property accounts. Replacements and maintenance and repairs that do not improve or extend the life of the respective assets are expensed as incurred.
Business Acquisition	Business Acquisition The application of the purchase method of accounting for business combinations requires the use of significant estimates and assumptions in determining the fair value of assets acquired and liabilities assumed in order to properly allocate the fair value of the acquired business. The estimates of the fair value of the assets acquired and liabilities assumed are based upon assumptions believed to be reasonable using established valuation techniques that consider a number of factors and when appropriate, valuations performed by independent third-party appraisers. Assets acquired and liabilities assumed in connection with business combinations are recorded based on their respective fair values at the date of acquisition.
Goodwill and Intangible Assets	Goodwill and Intangible Assets Goodwill represents the excess of costs over the fair value of net assets acquired. Goodwill is subject to evaluation for impairment using a fair value based test. This evaluation is performed annually, during the fourth quarter or more frequently if facts and circumstances warrant. The Company uses a qualitative approach to test goodwill for impairment by first assessing qualitative factors to determine whether it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test. The Company applies this qualitative approach as of October 1 annually to any and all reporting units. If required following the qualitative assessment, the first step in the goodwill impairment test involves comparing the fair value of each of a reporting unit to the carrying value of a reporting unit. If the carrying value of a reporting unit exceeds the fair value of the reporting unit, the Company is required to proceed to the second step. In the second step, the fair value of the reporting unit would be allocated to the assets (including unrecognized intangibles) and liabilities of the reporting unit, with any residual representing the implied fair value of goodwill. An impairment loss would be recognized if, and to the extent that, the carrying value of goodwill exceeded the implied value. The Company reviews amortizable intangible assets for impairment whenever events or circumstances indicate that carrying amounts may not be recoverable. If the Company concludes that impairment exists, the carrying amount is reduced to fair value.
Impairment of Long-Lived Assets Including Intangible Assets Subject to Amortization	Impairment of Long-Lived Assets Including Intangible Assets Subject to Amortization The Company assesses the recoverability of long-lived assets when events or circumstances indicate that the assets might have become impaired. The Company determines whether the assets can be recovered from undiscounted future cash flows and, if not recoverable, the Company recognizes impairment to reduce the carrying value to fair value. Recoverability of long lived assets is dependent upon, among other things, the Company’s ability to maintain profitability, so as to be able to meet its obligations when they become due. No impairment was recognized in any period presented.
Unpaid Losses and Loss Adjustment Expenses	Unpaid Losses and Loss Adjustment Expenses The Company’s reserves for unpaid losses and loss adjustment expenses represent the estimated ultimate cost of settling all reported claims plus all claims we incurred related to insured events that have occurred as of the reporting date, but that policyholders have not yet reported to the Company (incurred but not reported, or “IBNR”). The Company estimates its reserves for unpaid losses and loss adjustment expenses using individual case-based estimates for reported claims and actuarial estimates for IBNR losses. The Company continually reviews and adjusts its estimated losses as necessary based on industry development trends, the Company’s evolving claims experience and new information obtained. If the Company’s unpaid losses and loss adjustment expenses are considered to be deficient or redundant, the Company increases or decreases the liability in the period in which it identifies the difference and reflects the change in its current period results of operations. Though the Company’s estimate of the ultimate cost of settling all reported and unreported claims may change at any point in the future, a reasonable possibility exists that its estimate may vary significantly in the near term from the estimated amounts included in the Company’s consolidated financial statements. The Company reports its reserves for unpaid losses and loss adjustment expenses gross of the amounts related to unpaid losses recoverable from reinsurers and reports losses net of amounts ceded to reinsurers. The Company does not discount its loss reserves for financial statement purposes. The Company remains liable for claims payments if any reinsurer is unable to meet its obligations under the reinsurance agreements. Failure of reinsurers to honor their obligations could result in losses to the Company. The Company evaluates the financial condition of its reinsurers and monitors concentration of credit risk arising from similar geographic regions, activities or economics characteristics of the reinsurers to minimize its exposure to significant loses from reinsurers insolvencies. The Company contracts with several reinsurers to secure its annual reinsurance coverage, which the excess of loss treaties generally becomes effective June 1st each year. The Company purchases reinsurance each year taking into consideration probable maximum losses and reinsurance market condition.
Other Revenue	Other revenue Our insurance affiliates may charge policyholders a policy fee on each policy written; these fees are not subject to refund, and the Company recognizes the income immediately when collected. The Company also charges pay-plan fees to policyholders that pay its premiums in more than one installment and records the fees as income when collected. Other income includes rental income due under non-cancelable leases for space at the Company’s commercial property.
Reinsurance	Reinsurance The Company follows industry practice of reinsuring a portion of our risks. Reinsurance involves transferring, or “ceding”, all or a portion of the risk exposure on policies the Company writes to another insurer, known as a reinsurer. To the extent that the Company’s reinsurers are unable to meet the obligations they assume under the Company’s reinsurance agreements, the Company remains liable for the entire insured loss. The Company’s reinsurance agreements are generally short-term, prospective contracts. The Company records an asset, prepaid reinsurance premiums, and a liability, reinsurance payable, for the entire contract amount upon commencement of new reinsurance agreements. The Company amortizes its prepaid reinsurance premiums over the 12-month contract period. When the Company incurs losses recoverable under its reinsurance program, the Company records amounts recoverable from its reinsurers on paid losses plus an estimate of amounts recoverable on unpaid losses. The estimate of amounts recoverable on unpaid losses is a function of the Company’s liability for unpaid losses associated with the reinsured policies; therefore, the amount changes in conjunction with any changes to the estimate of unpaid losses. Given that an estimate of amounts recoverable from reinsurers on unpaid losses may change at any point in the future because of its relation to the Company’s reserves for unpaid losses, a reasonable possibility exists that an estimated recovery may change significantly from initial estimates. The Company estimates uncollectible amounts receivable from reinsurers based on an assessment of factors including the creditworthiness of the reinsurers and the adequacy of collateral obtained, where applicable. The Company recorded no uncollectible amounts under its reinsurance program or bad debt expense related to reinsurance for the years ended December 31, 2017, 2016 and 2015.
Assessment	Assessment Guaranty fund and other insurance-related assessments imposed upon the Company’s insurance company affiliates are recorded as policy acquisition costs in the period the regulatory agency imposes the assessment. To recover guaranty or other insurance-related assessments, the Company in turn submits a plan for recoupment to the Insurance Commissioner for approval and upon approval, begins collecting a policy surcharge that will allow it to collect the prior years assessments. There were no assessments during the periods presented. The Company collects other assessments imposed upon policyholders as a policy surcharge and records the amounts collected as a liability until the Company remits the amounts to the regulatory agency that imposed the assessment.
Long-Term Debt	Long-Term Debt A long-term debt instrument with embedded features such as conversion and redemption options is evaluated to determine whether bifurcation and derivative accounting is applicable. If such instrument is not subject to derivative accounting, it is further evaluated to determine if the Company is required to separately account for the liability and equity components. To determine the carrying values of the debt and derivative components at issuance, the Company measures the fair value of a similar liability, including any embedded features other than the conversion option, and assigns such value to the liability or equity component. The liability component’s fair value is then subtracted from the initial proceeds to determine the carrying value of the debt instrument’s derivative component. The conversion option liability is revalued each quarter. Any gain or loss is recorded as a non-operating expense on the Consolidated Statements of Operations and Comprehensive Income. On December 1, 2017, the derivative liability initially recognized in August 2017 was reevaluated and reclassified to equity. see Note 11 . Long-Term Debt
Debt Issuance and Discount Costs	Debt Issuance and Discount Costs In connection with the issuance of the Secured Notes and Convertible debt, the debt issuance and discount costs are reflected on the balance sheet as an offset to long-term debt, and amortized using the effective interest method over the life of the underlying debt instrument.
Stock-Based Compensation	Stock-Based Compensation The Company measures stock-based compensation at the grant date based on the fair value of the award and recognizes stock-based compensation expense over the requisite vesting period. Determining the fair value of stock option awards requires judgment, including estimating stock price volatility, forfeiture rates and expected option life. Restricted stock awards are valued based on the fair value of the stock on the grant date and the related compensation expense is recognized over the vesting period.
Earnings Per Share	Earnings Per Share The Company reports both basic earnings per share and diluted earnings per share. To calculate basic earnings per share, the Company divides net income attributable to common shareholders by the weighted-average number of shares outstanding during the period, including vested restricted shares. The Company calculates diluted earnings per share by dividing net income attributable to common shareholders by the weighted-average number of shares, and the effect of share equivalents, vested and unvested restricted shares and convertible notes outstanding during the period using the treasury stock method to calculate common stock equivalents.
Income Tax	Income tax Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which we expect to recover or settle those temporary differences. The effect on deferred taxes and liabilities attributable to a change in tax rates is recognized in income in the period that includes the enactment date. Deferred tax assets are recognized to the extent that there is sufficient positive evidence, as allowed under the Accounting Standard Codification Topic 740 ("ASC 740"), Income Taxes, to support the recoverability of those deferred tax assets. The Company establishes a valuation allowance to the extent that there is insufficient evidence to support the recoverability of the deferred tax asset under ASC 740. In making such a determination, management considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax planning strategies, and results of recent operations. If it is determined that the deferred tax assets would be realizable in the future in excess of their net recorded amount, an adjustment would be made to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. We recognize the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more likely than not threshold, the amount recognized in the consolidated financial statements is the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant taxing authority. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act of 2017 (the “Tax Act”), which makes broad and complex changes to the U.S. Tax code. One of the provisions of the Tax Act reduced the corporate federal income tax rate from 35% to 21% effective January 1, 2018. Pursuant to current accounting guidance, all deferred tax assets and liabilities were re-measured to recognize the tax rate that is expected to apply when the tax effects are ultimately recognized in future periods upon the date of enactment.
Concentrations of Risk	Concentrations of Risk The Company’s current operations subject us to the following concentrations of risk: • Revenue—The Company writes residential property and liability policies exclusively. • Geographic—The Company writes its premium in coastal states in the southeastern and northeastern United States and Hawaii, with over 95% of the premium written in Florida, Massachusetts, New Jersey, New York, and Hawaii. • Group concentration of credit risk—All of the Company’s reinsurers engage in similar activities and have similar economic characteristics that could cause their ability to repay us to be similarly affected by changes in economic or other conditions. • Credit risk—The Company chooses to deposit all its cash at twelve financial institutions. The Company mitigates its geographic and group concentrations of risk by entering into reinsurance contracts with highly rated, financially-stable reinsurers, and by securing irrevocable letters of credit from reinsurers when necessary. With regard to cash, the Company had $138.4 million and $123.4 million in excess of Federal Deposit Insurance Corporation (“FDIC”) insurance limits at December 31, 2017 and 2016, respectively. Deposits held in non- interest-bearing transaction accounts are combined with interest-bearing accounts and are insured up to $250,000.
Reclassifications	Reclassification Certain amounts in the consolidated financial statements for the period from December 31, 2016 have been reclassified to conform to the classification used to prepare the consolidated financial statements for the year ended December 31, 2017. These reclassifications had no material impact on the Company’s consolidated financial position, results of operations or cash flows as previously reported.
Accounting Pronouncements	Accounting Pronouncements The Company describes below recent pronouncements that may have a significant effect on its consolidated financial statements or on its disclosures upon future adoption. The Company does not discuss recent pronouncements that are not anticipated to have an impact on, or are unrelated to, its financial condition, results of operations, or related disclosures. In March 2018, the FASB issued ASU 2018-04, Investments-Debt Securities (Topic 320) and Regulated Operations (Topic 980). Investments-Debt Securities Regulated Operations The Company does not anticipate the adoption of ASU 2018-04 will have a material impact on its consolidated financial statements. In February 2018, the FASB issued ASU 2018-03, Recognition and Measurement of Financial Assets and Financial Liabilities, In February 2018, the FASB issued ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220) In May 2017, the FASB issued ASU No. 2017-09, Compensation–Stock Compensation (Topic 718): Scope of Modification Accounting In March 2017, the FASB issued ASU No 2017-08, Receivables – Nonrefundable Fees and Other Costs 310-20 In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805). Clarifying the Definition of a Business, In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), which requires entities to include in their cash and cash-equivalent balances in the statement of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents. The ASU does not define the terms “restricted cash” and “restricted cash equivalents.” The amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. The Company currently is reporting $20.1 million in restricted cash on its consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments In June 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses Measurement of Credit Losses on Financial Instruments In February 2016, the FASB issued ASU 2016-02, Lease Accounting, which amends the accounting treatment for leases. The amendments are effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Lessees (for capital and operating leases) and lessors (for sales-type leases, direct financing leases, and operating leases) must apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The modified retrospective approach would not require any transition accounting for leases that expired before the earliest comparative period presented. Lessees and lessors may not apply a full retrospective transition approach. Early adoption is permitted. The Company is currently evaluating the impact that the adoption of ASU 2016-02 may have on its consolidated financial statements. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities. The effect of adopting this guidance will be determined by the level of unrealized gains or losses associated with equity investments with readily determinable market values. Such unrealized gains or losses will be recognized upon adoption as a cumulative-effect adjustment with future unrealized gains or losses reflected in the statement of operations and comprehensive income. Refer to Note 3 for the status of such unrealized gains and losses levels that are currently recognized as other accumulated comprehensive income. In May 2014, the FASB issued ASU Topic 2014-09, Revenue from Contracts with Customers No other new accounting pronouncement issued or effective during the fiscal year had or is expected to have a material impact on our consolidated financial statements or disclosures.

Business Acquisitions (Tables)

Business Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Summary of Preliminary Allocation of Purchase Price	The following table summarizes the allocation of the purchase price as of the balance sheet date: Purchase Consideration Cash and stock, net of cash acquired $ 180,919 Assets acquired Investments $ 101,215 Premiums and agent's receivable 24,127 Other assets 13,173 Prepaid reinsurance premiums 137,378 Reinsurance recoverable on paid and unpaid claims 73,073 Intangible assets 81,240 Total assets acquired $ 430,206 Liabilities assumed Unpaid losses and loss adjustment expenses 93,804 Unearned premiums 175,050 Reinsurance payable 16 Deferred revenue 57,809 Accounts payable 12,913 Other liabilities assumed 15,701 Total liabilities assumed $ 355,293 Net assets acquired $ 74,914 Goodwill (1) 106,005 Total purchase price, net of cash acquired $ 180,919 1. Goodwill largely consists of expected synergies and economies of scale resulting from the business combination
NBIC Holdings, Inc [Member]
Summary of Pro Forma Information	The following unaudited pro forma results of operations assume that the NBIC acquisition occurred at the beginning of the periods presented. The pro forma amounts include certain adjustments, including depreciation and amortization expense and income taxes. The pro forma amounts for the twelve month period below exclude acquisition-related charges. Accordingly, these unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what have been if the acquisitions had occurred as of January 1, 2016, nor are they indicative of future results of operations. Year Ended December 31, 2017 2016 (in thousands, except per share) Revenue $ 456,560 $ 511,663 Net income $ 13,844 $ 42,397 Basic, earnings per share $ 0.48 $ 1.33 Diluted, earnings per share $ 0.47 $ 1.33 The following table summarizes the results of the acquired NBIC operations since the acquisition date that have been included within our consolidated statement of operations. November 30, 2017 to December 31, 2017 (in thousands) Total revenue $ 5,475 Net income $ 9,121
ZAC Business Acquisition [Member]
Summary of Pro Forma Information	The following table presents selected pro forma information, assuming the acquisition of ZAC had occurred on January 1, 2016. The unaudited pro forma information is not necessarily indicative of the results that the Company would have achieved had the transaction taken place on January 1, 2016 and the unaudited pro forma information does not purport to be indicative of future financial results. Year Ended December 31, 2016 2015 (in thousands, except per share) Revenue $ 447,780 $ 432,070 Net income $ 36,817 $ 104,722 Basic, earnings per share $ 1.24 $ 3.48 Diluted, earnings per share $ 1.24 $ 3.45

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2017
Investments Debt And Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Investment Securities	The following table details the difference between cost or adjusted/amortized cost and estimated fair value, by major investment category, at December 31, 2017 and December 31, 2016: Cost or Adjusted / Amortized Cost Gross Gains Gross Losses Fair Value (In thousands) December 31, 2017 U.S. government and agency securities $ 39,445 $ 7 $ 572 $ 38,880 States, municipalities and political subdivisions 76,876 104 569 76,411 Special revenue 269,277 524 2,124 267,677 Industrial and miscellaneous 162,093 668 633 162,128 Redeemable preferred stocks 4,767 4 71 4,700 Total fixed maturities 552,458 1,307 3,969 549,796 Nonredeemable preferred stocks 14,450 69 195 14,324 Equity securities 3,098 64 269 2,893 Total equity securities 17,548 133 464 17,217 Total investments $ 570,006 $ 1,440 $ 4,433 $ 567,013 Cost or Adjusted / Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (In thousands) December 31, 2016 U.S. government and agency securities $ 107,968 $ 29 $ 449 $ 107,548 States, municipalities and political subdivisions 281,935 298 4,872 277,361 Special revenue 53,726 29 759 52,996 Industrial and miscellaneous 129,687 535 577 129,645 Redeemable preferred stocks 3,595 15 149 3,461 Total fixed maturities 576,911 906 6,806 571,011 Nonredeemable preferred stocks 14,935 40 460 14,515 Equity securities 19,255 1,197 2,996 17,456 Total equity securities 34,190 1,237 3,456 31,971 Total investments $ 611,101 $ 2,143 $ 10,262 $ 602,982
Schedule of Realized Gains (Losses) by Major Investment Category	The Company calculates the gain or loss realized on the sale of investments by comparing the sales price (fair value) to the cost or adjusted/amortized cost of the security sold. The Company determines the cost or adjusted/amortized cost of the security sold using the specific-identification method. The following tables detail the Company’s realized gains (losses) by major investment category as of December 31, 2017 and 2016, respectively: 2017 2016 Gains (Losses) Fair Value at Sale Gains (Losses) Fair Value at Sale (In thousands) Year Ended December 31, Fixed maturities $ 2,732 $ 705,138 $ 2,782 $ 70,728 Equity securities 2,131 31,231 108 8,337 Total realized gains 4,863 736,369 2,890 79,065 Fixed maturities (363 ) 56,354 (253 ) 15,496 Equity securities (3,936 ) 11,806 (904 ) 5,098 Total realized losses (4,299 ) 68,160 (1,157 ) 20,594 Net realized gains $ 564 $ 804,529 $ 1,733 $ 99,659
Schedule of Amortized Cost and Fair Value of Investment Securities by Contractual Maturity	The table below summarizes the Company’s fixed maturities at December 31, 2017 and 2016 by contractual maturity periods. Actual results may differ as issuers may have the right to call or prepay obligations, with or without penalties, prior to the contractual maturity of those obligations. December 31, 2017 Cost or Amortized Cost Percent of Total Fair Value Percent of Total (In thousands) (In thousands) Due in one year or less $ 81,783 15 % $ 81,668 15 % Due after one year through five years 169,452 31 % 168,671 31 % Due after five years through ten years 154,400 28 % 153,463 28 % Due after ten years 146,823 26 % 145,994 26 % Total $ 552,458 100 % $ 549,796 100 % December 31, 2016 Cost or Amortized Cost Percent of Total Fair Value Percent of Total (In thousands) (In thousands) Due in one year or less $ 158,517 28 % $ 158,496 28 % Due after one year through five years 173,221 30 % 172,309 30 % Due after five years through ten years 145,299 25 % 142,259 25 % Due after ten years 99,874 17 % 97,947 17 % Total $ 576,911 100 % $ 571,011 100 %
Summary of Net Investment Income	The following table summarizes the Company’s net investment income by major investment category for the years ended December 31, 2017, 2016 and 2015, respectively: For the Year Ended December 31, 2017 2016 2015 (In thousands) Fixed maturities $ 10,368 $ 8,709 $ 6,960 Equity securities 1,922 1,955 1,811 Cash, cash equivalents and short-term investments 960 226 258 Other investments 197 21 259 Net investment income 13,447 10,911 9,289 Investment expenses 2,115 1,730 1,868 Net investment income, less investment expenses $ 11,332 $ 9,181 $ 7,421
Aging of Gross Unrealized Investment Losses	The following table presents an aging of the Company’s unrealized investment losses by investment class as of December 31, 2017 and December 31, 2016: Less Than Twelve Months Twelve Months or More Number of Securities Gross Unrealized Losses Fair Value Number of Securities Gross Unrealized Losses Fair Value (In thousands) December 31, 2017 U.S. government and agency securities 53 $ 284 $ 20,053 24 $ 289 $ 9,294 States, municipalities and political subdivisions 51 359 49,803 8 210 10,503 Industrial and miscellaneous 284 376 87,898 38 256 11,788 Special revenue 295 777 133,580 183 1,347 69,359 Redeemable preferred stocks 41 66 3,987 17 5 61 Total fixed maturities 724 1,862 295,321 270 2,107 101,005 Nonredeemable preferred stocks 127 188 10,047 6 7 159 Equity securities 11 46 677 12 223 1,095 Total equity securities 138 $ 234 $ 10,724 18 $ 230 $ 1,254 Total 862 $ 2,096 $ 306,045 288 $ 2,337 $ 102,259 Less Than Twelve Months Twelve Months or More Number Gross Losses Fair Number of Securities Gross Unrealized Losses Fair Value (In thousands) December 31, 2016 U.S. government and agency securities 35 $ 448 $ 24,649 2 $ 1 $ 200 States, municipalities and political subdivisions 265 4,869 220,034 2 3 1,497 Industrial and miscellaneous 161 571 56,996 2 6 974 Special revenue 189 631 44,712 11 129 1,828 Redeemable preferred stocks 19 143 2,425 1 6 212 Total fixed maturities 669 6,662 348,816 18 145 4,711 Nonredeemable preferred stocks 77 439 11,298 5 20 234 Equity securities 26 191 2,542 29 2,805 7,317 Total equity securities 103 $ 630 $ 13,840 34 $ 2,825 $ 7,551 Total 772 $ 7,292 $ 362,656 52 $ 2,970 $ 12,262

Goodwill and Other Intangible34

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Estimated Amortization of Intangible Assets	Estimated annual pretax amortization of intangible assets for each of the next five years and thereafter is as follows (in thousands): Year Amount 2018 $ 24,776 2019 $ 8,208 2020 $ 6,365 2021 $ 6,351 2022 $ 6,351 Thereafter $ 48,260 $ 100,311
Schedule of Goodwill	Goodwill (in thousands) Balance as of December 31, 2015 $ 8,028 Goodwill acquired 38,426 Impairment — Balance as of December 31, 2016 $ 46,454 Goodwill acquired 106,005 Impairment — Balance as of December 31, 2017 $ 152,459
Schedule of Amortizing and Non-amortizing Intangible Assets	The tables below detail the finite-lived intangible assets, net as of December 31, 2017 and 2016, respectively (amounts in thousands): December 31, 2017 Weighted -average Amortization (years) Gross Carrying Amount Accumulated Amortization Intangible Assets, net (1) Amortizing intangible assets Brand 14 $ 1,210 $ (195 ) $ 1,015 Agent relationships 10 15,500 (789 ) 14,711 Renewal rights 15 57,200 (2,162 ) 55,038 Customer relations 8 870 (211 ) 659 Trade names 10 9,000 (408 ) 8,592 Value of business acquired 1 25,400 (9,083 ) 16,317 Non-compete 2 4,790 (811 ) 3,979 Total intangible assets $ 113,970 $ (13,659 ) $ 100,311 (1) Excludes insurance license valued at $1.3 million and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized. December 31, 2016 Weighted -average Amortization (years) Gross Carrying Amount Accumulated Amortization Intangible Assets, net (1) Amortizing intangible assets Brand 15 $ 1,210 $ (114 ) $ 1,096 Agent relationships 12 4,800 (300 ) 4,500 Renewal rights 15 16,600 (830 ) 15,770 Customer relations 10 870 (123 ) 747 Trade names 10 2,000 (150 ) 1,850 Value of business acquired 1 7,600 (5,700 ) 1,900 Non-compete 2.5 790 (286 ) 504 Total intangible assets $ 33,870 $ (7,503 ) $ 26,367 (1) Excludes insurance license valued at $175,000 and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted EPS	The following table sets forth the computation of basic and diluted EPS for the periods indicated: For the Year Ended December 31, 2017 2016 2015 Basic earnings per share: Net (loss) income attributable to common stockholders (000's) $ (1,119 ) $ 33,865 $ 92,512 Weighted average shares outstanding 26,798,465 29,632,171 30,056,491 Basic (loss) earnings per share: $ (0.04 ) $ 1.14 $ 3.08 Diluted earnings per share: Net (loss) income attributable to common stockholders (000's) $ (1,119 ) $ 33,865 $ 92,512 Weighted average shares outstanding 26,798,465 29,632,171 30,056,491 Weighted average dilutive shares — 2,178 269,977 Total weighted average dilutive shares 26,798,465 29,634,349 30,326,468 Diluted (loss) earnings per share: $ (0.04 ) $ 1.14 $ 3.05

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Fair Value Measurements	The following table presents information about the Company’s assets measured at fair value on a recurring basis. The Company assesses the levels for the investments at each measurement date, and transfers between levels are recognized on the actual date of the event or change in circumstances that caused the transfer in accordance with the Company’s accounting policy regarding the recognitions of transfers between levels of the fair value hierarchy. For the years ended December 31, 2017 and 2016, there were no transfers in or out of Level 1, 2, and 3. December 31, 2017 Total Level 1 Level 2 Level 3 (in thousands) Fixed maturities investments: U.S. government and agency securities $ 38,880 $ 359 $ 38,521 $ — States, municipalities and political subdivisions 76,411 — 76,411 — Special revenue 267,677 — 267,677 — Industrial and miscellaneous 162,128 — 162,128 — Redeemable preferred stocks 4,700 — 4,700 — Total fixed maturities investments $ 549,796 $ 359 $ 549,437 $ — Nonredeemable preferred stocks 14,324 14,324 — — Equity securities 2,893 2,893 — — Total equity securities $ 17,217 $ 17,217 $ — $ — Total investments $ 567,013 $ 17,576 $ 549,437 $ — December 31, 2016 Total Level 1 Level 2 Level 3 (in thousands) Fixed maturities investments: U.S. government and agency securities $ 107,548 $ 103,997 $ 3,551 $ — States, municipalities and political subdivisions 277,361 — 277,361 — Special revenue 52,996 — 52,996 — Industrial and miscellaneous 129,645 — 129,645 — Redeemable preferred stocks 3,461 3,461 — — Total fixed maturities investments $ 571,011 $ 107,458 $ 463,553 $ — Nonredeemable preferred stocks 14,515 14,515 — — Equity securities 17,456 17,456 — — Total equity securities $ 31,971 $ 31,971 $ — $ — Total investments $ 602,982 $ 139,429 $ 463,553 $ —

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net consists of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 December 31, 2016 (In thousands) Land $ 2,582 $ 2,582 Building 12,148 10,301 Computer hardware and software 4,093 3,113 Office furniture and equipment 759 759 Tenant and leasehold improvements 3,660 3,334 Vehicle fleet 815 842 Total, at cost 24,057 20,931 Less: accumulated depreciation and amortization 5,309 3,752 Property and equipment, net $ 18,748 $ 17,179
Schedule of Expected Annual Rental Income Due Under Non-Cancellable Operating Leases for Real Estate Properties	Expected annual rental income due under non-cancellable operating leases for our real estate properties is as follows (in thousands): Year Amount January 1 to December 31, 2018 $ 2,458 January 1 to December 31, 2019 2,461 January 1 to December 31, 2020 2,521 January 1 to December 31, 2021 2,581 January 1 to December 31, 2022 2,636 Thereafter 2,063 $ 14,720

Deferred Policy Acquisition C38

Deferred Policy Acquisition Costs (Tables)	12 Months Ended
	Dec. 31, 2017
Insurance [Abstract]
Summary of Activity in Deferred Policy Acquisition Costs (DPAC)	The table below depicts the activity with regard to DPAC for the years ended December 31, 2017 and 2016: For the Year Ended December 2017 2016 (In thousands) Beginning Balance $ 42,779 $ 34,800 Policy acquisition costs incurred 82,791 92,400 Amortization (83,892 ) (84,421 ) Ending Balance $ 41,678 $ 42,779

Reserve for Unpaid Losses (Tabl

Reserve for Unpaid Losses (Tables)	12 Months Ended
	Dec. 31, 2017
Insurance [Abstract]
Summary of Reserve for Unpaid Losses	The table below summarizes the activity related to the Company’s reserve for unpaid losses: For the Year Ended December 31, 2017 2016 2015 Balance, beginning of period $ 140,137 $ 83,722 $ 51,469 Less: reinsurance recoverable on unpaid losses 589 — — Net balance, beginning of period 139,548 83,722 51,469 Incurred related to: Current year 188,914 220,071 146,484 Prior years 12,567 18,791 (5,293 ) Total incurred 201,481 238,862 141,191 Paid related to: Current year 114,344 120,626 81,673 Prior years 107,479 62,407 27,265 Total paid 221,823 183,033 108,938 Total unpaid claims assumed from acquisitions 35,524 — — Net balance, end of period 154,730 139,551 83,722 Plus: reinsurance recoverable on unpaid losses 315,353 586 — Balance, end of period $ 470,083 $ 140,137 $ 83,722
Summary of Incurred, Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	The following is information about incurred and paid claims development as of December 31, 2017, net of reinsurance, as well as cumulative claim frequency and the total of incurred-but-not-reported liabilities plus expected development on reported claims included within the net incurred claims amounts. Heritage P&C and Zephyr Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (in thousands, except number of claims) Unaudited Accident year 2012 2013 2014 2015 2016 2017 Net IBNR Reserves Reported Claims 2012 $ 1,396 $ 851 $ 811 $ 784 $ 797 $ 823 $ 21 134 2013 37,005 35,819 37,212 37,090 38,537 1,220 3,618 2014 91,839 86,508 86,634 88,423 1,606 7,801 2015 141,125 159,899 166,222 9,466 11,177 2016 207,183 212,540 12,901 15,613 2017 171,585 59,979 40,826 Total $ 678,130 $ 85,193 Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance Unaudited Accident year 2012 2013 2014 2015 2016 2017 2012 $ 12 $ 615 $ 695 $ 756 $ 766 $ 631 2013 18,625 29,023 32,414 35,322 36,497 2014 47,408 70,932 79,341 84,421 2015 76,310 130,267 147,188 2016 107,771 184,397 2017 89,110 Total $ 542,244 Narragansett Bay Insurance Company and Pawtucket Insurance Company Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (in thousands, except number of claims) Unaudited Unaudited Accident year 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 Net IBNR Reserves Reported Claims 2008 and prior $ 1,796 $ 1,502 $ 1,478 $ 1,576 $ 1,485 $ 1,485 $ 1,485 $ 1,485 $ 1,484 $ 1,483 $ 325 233 2009 3,664 3,069 3,095 3,160 3,205 3,205 3,196 3,187 3,191 — 502 2010 11,607 11,217 11,083 11,417 11,538 11,547 11,559 11,547 2 2,160 2011 35,433 37,424 37,029 37,752 37,117 36,822 36,726 6 10,877 2012 48,175 51,778 53,051 52,364 52,482 52,884 84 39,431 2013 24,152 25,664 25,757 25,076 23,817 303 9,464 2014 27,152 28,391 27,213 26,561 917 10,622 2015 38,130 37,845 37,570 1,175 14,377 2016 30,024 30,071 1,844 10,672 2017 17,578 2,508 10,576 $ 241,428 $ 7,164 Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance Unaudited Accident year 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2008 and prior $ 1,047 $ 1,335 $ 1,319 $ 1,406 $ 1,485 $ 1,483 $ 1,484 $ 1,484 $ 1,484 $ 1,483 2009 1,794 2,778 2,788 2,992 3,058 3,128 3,186 3,186 3,188 2010 8,589 10,194 10,418 10,792 11,024 11,309 11,336 11,333 2011 28,767 35,575 35,953 36,546 36,800 36,711 36,683 2012 42,427 49,422 49,873 50,558 50,879 51,735 2013 17,146 21,693 23,175 22,325 22,898 2014 21,324 24,144 22,115 24,088 2015 27,608 32,387 34,484 2016 24,908 27,115 2017 14,038 $ 227,045
Summary of Reconciliation of Reserve Balances to Liability for Unpaid Loss and Loss Adjustment Expenses	Reconciliation of Reserve Balances to Liability for Unpaid Loss and Loss Adjustment Expenses Unpaid Loss and Allocated Loss Adjustment Expense, Net of Reinsurance $ 135,886 Ceded Unpaid Loss and Allocated Loss Adjustment Expense 238,508 Unpaid Unallocated Loss Adjustment Expense 1,800 Unpaid losses and loss adjustment expenses $ 376,194 Reconciliation of Reserve Balances to Liability for Unpaid Loss and Loss Adjustment Expenses Unpaid Loss and Allocated Loss Adjustment Expense, Net of Reinsurance $ 14,383 Ceded Unpaid Loss and Allocated Loss Adjustment Expense 76,845 Unpaid Unallocated Loss Adjustment Expense 2,661 Unpaid losses and loss adjustment expenses $ 93,889
Summary of Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance	Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance as of December 31, 2017 (Unaudited) Year - 1 Year - 2 Year - 3 Year - 4 Year - 5 Thereafter Percentage 52% 32% 5% 6% 0% 5% Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance as of December 31, 2017 (Unaudited) Year 1 2 3 4 5 6 7 8 9 10 Thereafter Percentage 75% 16% 1% 3% 2% 1% 1% 0% 0% 0% 1%

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Schedule of Company's Long-Term Debt	The following table summarizes the Company’s long-term debt (in thousands): December 31, 2017 December 31, 2016 Convertible debt $ 115,624 $ — Mortgage loan 12,658 — Senior Note payable 79,500 79,500 Total principal amount $ 207,782 $ 79,500 Less: unamortized discount and issuance costs Debt discount and issuance cost on convertible debt 17,605 — Debt issuance cost on senior note payable 5,772 6,595 Total long-term debt $ 184,405 $ 72,905
Schedule of Expected Annual Principal Payments Due under Long-Term Debt Agreements	Expected annual principal payments due by the Company under the long-term debt agreements is as follows: Year Amount (In thousands) 2018 $ 2,210 2019 7,742 2020 7,036 2021 6,403 2022 5,831 Thereafter 178,560 $ 207,782
Convertible Senior Notes [Member]
Valuation of Embedded Derivatives within Convertible Note	The valuation of the embedded derivatives within the convertible note was completed with the following assumptions: Assumptions August 10, 2017 September 30, 2017 December 1, 2017 Dividend yield 2.13 % 1.82 % 1.33 % Yield 10.2 % 8.5 % 8.5 % Risk-free rate 2.55 % 2.63 % 2.58 % Volatility 25.8 % 20.5 % 20.0 % Remaining Term (years) 4.98 4.84 4.67 Stock price $ 11.26 $ 13.21 $ 18.00
Summary of Derivative Liability Activity	The following table summarizes the derivative liability activity for the year ended December 31, 2017: Description Derivative Liabilities (In thousands) Fair value at issuance $ 16,838 Change fair value 41,013 Conversion option related to extinguishment of notes 6,211 Carrying value at December 31, 2017 $ 51,641

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Summary of Provision for Income Taxes	The following table summarizes the provision for income taxes: For the Year Ended December 31, 2017 2016 2015 (In thousands) Federal: Current $ (24,380 ) $ 16,575 $ 48,524 Deferred 18,383 2,735 970 Provision for Federal income tax (benefit) expense (5,997 ) 19,310 49,494 State: Current (20 ) 2,893 8,238 Deferred 1,244 335 46 Provision for State income tax expense 1,224 3,228 8,284 (Benefit) provision for income taxes $ (4,773 ) $ 22,538 $ 57,778
Summary of U.S. Federal Income Tax Rate to Pretax Income	The income tax (benefit) expense differs from the amounts computed by applying the U.S. federal income tax rate of 35% to pretax income as a result of the following (in thousands): For the Year Ended December 31, 2017 2016 2015 Expected income tax expense at federal rate 35.0 % 35.0 % 35.0 % State tax expense (22.8 )% 3.7 % 3.6 % Permanent items (2.3 )% 0.2 % (0.1 )% Non-deductible conversion option liability (255.0 )% — — Non-deductible stock compensation (26.0 )% 0.1 % — Tax exempt interest 27.0 % (2.1 )% (0.6 )% Non-deductible acquisition costs (15.2 )% 0.2 % 0.1 % Executive compensation 162(m) (11.5 )% 1.1 % — Political contributions (7.8 )% 0.7 % 0.1 % Tax rate change 362.3 % — — Other (2.7 )% 1.1 % 0.4 % Reported income tax expense 81.0 % 40.0 % 38.5 %
Components of Deferred Tax Assets (Liabilities)	For the Year Ended December 31, 2017 2016 Deferred tax assets: (In thousands) Unearned premiums $ 12,488 $ 17,209 Unearned commission 11,987 — Net operating loss 4,727 — Tax-related discount on loss reserve 1,250 1,829 Unrealized loss — 3,113 Stock-based compensation — 1,604 Prepaid expenses 1,950 1,482 Other 331 312 Total deferred tax asset 32,733 25,549 Deferred tax liabilities: Deferred acquisition costs 9,775 16,377 Prepaid expenses 27,568 — Unrealized gain 30 — Property and equipment — 355 Note discount 3,818 — Basis in purchased investments 335 1,697 Basis in purchased intangibles 24,250 9,791 Other 1,290 332 Total deferred tax liabilities 67,066 28,552 Net deferred tax liability $ (34,333 ) $ (3,003 )

Statutory Accounting and Regu42

Statutory Accounting and Regulations (Tables)	12 Months Ended
	Dec. 31, 2017
Income Statement [Member]
Consolidated GAAP Net (Loss) Income to Statutory Net Income of Insurance Subsidiaries	The table below reconciles the Company’s consolidated GAAP net (loss) income to statutory net income of its insurance subsidiaries (in thousands): For the Year Ended December 31, 2017 2016 2015 Consolidated GAAP net (loss) income $ (1,119 ) $ 33,865 $ 92,512 Increase (decrease) due to: Deferred income taxes 32,644 6,069 1,755 Deferred acquisition costs 1,101 (7,979 ) (10,430 ) Surplus note interest (4 ) — (347 ) Non-statutory subsidiaries 5,410 (32,874 ) (36,569 ) Investment basis difference 446 540 — Pre-acquisition income 20,839 3,755 — Equity compensation (2,408 ) (2,107 ) (1,074 ) Convertible notes 1,051 — — Commission revenue (6,700 ) — — Allowance for doubtful accounts — — (250 ) Other (709 ) (702 ) — Statutory net income of insurance subsidiaries $ 50,551 $ 567 $ 45,597

Accounts Payable and Other Li43

Accounts Payable and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Schedule of Other Liabilities	Other liabilities consist of the following as of December 31, 2017 and December 31, 2016: Description December 31, 2017 December 31, 2016 (In thousands) Deferred ceding commission $ 51,109 $ — Outstanding claim checks 79,666 — Accounts payable and other payables 17,948 6,804 Accrued interest and issuance costs 3,117 5,704 Accrued dividends — 1,784 Escrow 1,210 1,210 Premium tax 3,660 — Other liabilities 218 — Commission payables 12,609 6,179 Total other liabilities $ 169,537 $ 21,681

Equity (Tables)

Equity (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Summary of Cash Dividends	For the year ended December 31, 2017, we recorded quarterly cash dividends of approximately $6.5 million as follows: Quarter Ended March 2, 2017 May 2, 2017 August 8, 2017 October 31, 2017 Cash dividend per common share $ 0.06 $ 0.06 $ 0.06 $ 0.06 Total cash dividends paid $ 1,784,426 $ 1,743,385 $ 1,478,333 $ 1,458,787 Record date March 15, 2017 June 15, 2017 September 15, 2017 November 17, 2017 Payment date April 4, 2017 July 5, 2017 October 2, 2017 December 15, 2017 Cash dividends declared on our outstanding weighted average number of basic common shares for the periods presented were as follows: For the Years Ended December 31, 2017 2016 Cash dividends per common share $ 0.30 $ 0.23

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Option Activity	Stock option activity for the three years ended December 31, 2017, 2016 and 2015 is as follows: Shares Weighted-Average Grant Date Fair Value Balance at December 31, 2014 1,685,923 $ 2.79 Granted — Exercised (536,000 ) $ 4.29 Expired — Balance at December 31, 2015 1,149,923 $ 2.99 Granted — Exercised — Expired — Balance at December 31, 2016 1,149,923 $ 2.99 Granted — Exercised (24,680 ) $ 3.07 Expired (1,125,243 ) $ 2.99 Balance at December 31, 2017 — Vested and exercisable as of December 31, 2017 —
Schedule of Restricted Stock Activity	Restricted stock activity for the three years ended December 31, 2017, 2016 and 2015 is as follows: Weighted-Average Grant-Date Fair Number of shares Value per Share Non-vested, at December 31, 2014 — — Granted 1,125,000 $ 21.40 Vested — — Canceled and surrendered — — Non-vested, at December 31, 2015 1,125,000 $ 21.40 Granted — — Vested (158,365 ) $ 14.67 Canceled and surrendered (66,635 ) $ 14.67 Non-vested, at December 31, 2016 900,000 $ 18.42 Granted — — Vested (137,935 ) $ 16.53 Canceled and surrendered (87,065 ) $ 17.41 Non-vested, at December 31, 2017 675,000 $ 21.40
Summary of Deferred Tax Benefits Recognized and Tax Benefits Realized to Restricted Stock Awards	The following table summarizes information about deferred tax benefits recognized and tax benefits realized from restricted stock awards and related paid dividends, and the fair value of vested restricted stock for the years ended December 31, 2017, 2016 and 2015, respectively. For the Year Ended December 31, 2017 2016 2015 Deferred tax benefit recognized $ — $ — $ 76 Tax benefit realized for restricted stock and paid dividends — — 357 Fair value of vested restricted stock 3,796 3,301 —

Condensed Financial Informati46

Condensed Financial Information of Heritage Insurance Holdings, Inc. (Tables)	12 Months Ended
	Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Schedule of Condensed Balance Sheets	The following summarizes the major categories of Heritage Insurance Holdings, Inc.’s financial statements: BALANCE SHEET As of December 31, 2017 2016 (In thousands) ASSETS Fixed maturity securities, available for sale, at fair value $ — $ 77,922 Cash and cash equivalents 16,249 7,368 Investment in and advances to subsidiaries 584,983 334,983 Other assets 1,294 19,055 Total Assets $ 602,526 $ 439,328 LIABILITIES AND STOCKHOLDERS' EQUITY Other liabilities 222,710 81,369 Total Liabilities $ 222,710 $ 81,369 Total Stockholders' Equity $ 379,816 $ 357,959 Total Liabilities and Stockholders' Equity $ 602,526 $ 439,328
Schedule of Condensed Statements of Operations	STATEMENT OF OPERATIONS For the Year Ended December 31, 2017 2016 2015 (In thousands, except share and per share amounts) Revenue: Other revenue $ 1,949 $ 1,403 $ 1,129 Total revenue 1,949 1,403 1,129 Expenses: General and administrative expense 17,792 11,558 9,036 Amortization of debt issuance cost 2,314 41 — Interest expense, net 11,158 321 — Other non-operating expense, net 41,013 — — Total expenses $ 72,277 $ 11,920 $ 9,036 Loss before income taxes and equity in net income of subsidiaries (70,328 ) (10,517 ) (7,907 ) Benefit from income taxes (6,120 ) (2,035 ) (2,227 ) Loss before equity in net income of subsidiaries (64,208 ) (8,482 ) (5,680 ) Equity in net income of subsidiaries — — 98,192 Net (loss) income $ (64,208 ) $ (8,482 ) $ 92,512
Schedule of Condensed Statements of Cash Flows	STATEMENT OF CASH FLOWS For the Year Ended December 31, 2017 2016 2015 (In thousands) Net cash provided by (used in) operating activities $ 27,154 $ (6,045 ) $ 7,196 Investing Activities Purchases of investment available for sale 78,213 (77,910 ) — Dividends received from subsidiaries 57,575 85,096 21,400 Acquisition of a business (210,000 ) Investments and advances to subsidiaries — (74,361 ) (32,400 ) Net cash used in investing activities (47,058 ) (73,220 ) (3,804 ) Financing Activities Proceeds from exercise of stock options and warrants 417 — 8,900 Proceeds from issuance of note payable, net of issuance costs 114,335 77,910 — Proceeds from mortgage loan 12,658 — — Excess tax (expense) benefit on stock-based compensation — (739 ) 739 Shares tendered for income tax withholdings (1,599 ) (977 ) — Purchase of treasury stock (61,623 ) (25,562 ) — Dividends (8,249 ) (6,806 ) — Net cash provided by financing activities 55,939 43,826 9,639 Increase (decrease) in cash and cash equivalents 8,881 (29,394 ) 5,835 Cash and cash equivalents, beginning of period 7,368 36,762 30,927 Cash and cash equivalents, end of year $ 16,249 $ 7,368 $ 36,762

Summary of Quarterly Results (T

Summary of Quarterly Results (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Summary of Unaudited Quarterly Results	The following table provides a summary of unaudited quarterly results for the periods presented (in thousands, except per share data): For the year ended December 31, 2017 First Quarter Second Quarter Third Quarter Fourth Quarter Net premiums earned $ 92,176 $ 90,452 $ 95,208 $ 101,728 Investment income $ 2,502 $ 2,973 $ 2,735 $ 3,122 Total revenues $ 99,293 $ 96,938 $ 101,774 $ 108,618 Total operating expenses $ 87,403 $ 83,876 $ 100,361 $ 85,448 Operating income $ 11,890 $ 13,062 $ 1,413 $ 23,170 Net income (loss) $ 5,983 $ 6,642 $ (8,696 ) $ (5,048 ) Basic earnings per share $ 0.21 $ 0.23 $ (0.34 ) $ (0.18 ) Diluted earnings per share $ 0.21 $ 0.23 $ (0.34 ) $ (0.18 ) For the year ended December 31, 2016 First Quarter Second Quarter Third Quarter Fourth Quarter Net premiums earned $ 106,342 $ 108,918 $ 101,555 $ 94,906 Investment income $ 2,037 $ 2,223 $ 2,326 $ 2,595 Total revenues $ 111,565 $ 115,281 $ 109,306 $ 102,806 Total expenses $ 99,525 $ 85,524 $ 90,694 $ 106,450 Operating income $ 12,040 $ 29,757 $ 18,612 $ (3,644 ) Net income (loss) $ 7,423 $ 18,368 $ 10,930 $ (2,856 ) Basic earnings per share $ 0.24 $ 0.62 $ 0.37 $ (0.09 ) Diluted earnings per share $ 0.24 $ 0.62 $ 0.37 $ (0.09 )

Basis of Presentation, Nature48

Basis of Presentation, Nature of Business and Significant Accounting Policies and Practices - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017USD ($)Segment	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 01, 2017USD ($)Policy
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Number of reporting Segment | Segment		1
Highly liquid investments with original maturity		3 months
Restricted cash		$ 20,833,000	$ 20,910,000
Allowance for uncollectible premiums		0	0
Bad debt expense (recovery), uncollectible premiums		0	250,000	$ (250,000)
Impairment of long-lived assets		0	0	0
Amounts recoverable under reinsurance program		$ 0	$ 0	$ 0
U.S. federal corporate tax rate		35.00%	35.00%	35.00%
Cash deposits in excess of FDIC insurance limits		$ 138,400,000	$ 123,400,000
Deposits held		250,000
ASU 2016-18 [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Restricted cash		$ 20,100,000
Scenario Forecast [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
U.S. federal corporate tax rate	21.00%
Building [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Property plant and equipment useful life		40 years
Computer Hardware and Software [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Property plant and equipment useful life		3 years
Minimum [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Allowance for credit losses for amounts outstanding, term		90 days
Tax benefit likelihood percentage		50.00%
Minimum [Member] | Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] | Florida Massachusetts New Jersey New York and Hawaii [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Concentration risk premium written		95.00%
Minimum [Member] | Office and Furniture Equipment [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Property plant and equipment useful life		3 years
Maximum [Member] | Office and Furniture Equipment [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Property plant and equipment useful life		7 years
Sawgrass Mutual Insurance Company [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Policies assumed					$ 30,000,000
Number of policies acquired | Policy					19,000
Heritage Property and Casualty Insurance Company [Member]
Basis Of Presentation Nature Of Business And Significant Accounting Policies And Practices [Line Items]
Restricted cash		$ 18,300,000

Business Acquisitions - Additio

Business Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands		Nov. 30, 2017	Mar. 21, 2016	Jul. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Cash and stock, net of cash acquired					$ 140,919	$ 110,319	$ 6,000
Goodwill					152,459	$ 46,454	$ 8,028
NBIC Holdings, Inc [Member]
Business Acquisition [Line Items]
Purchase price		$ 250,000
Purchase price for the acquisition in cash		$ 210,000
Issuance of common stock for business acquisition, number of restricted common shares		2,222,215
Purchase price for the acquisition, common stock aggregate value		$ 40,000
Number of shares placed into escrow account		687,802
Net income includes tax benefit, due to tax reform					$ 2,200
Cash and stock, net of cash acquired		$ 180,919
Goodwill	[1]	106,005
Investments		101,215
Liabilities assumed		$ 355,293
ZAC Business Acquisition [Member]
Business Acquisition [Line Items]
Percentage of outstanding stock acquired			100.00%
Cash and stock, net of cash acquired			$ 110,300
Intangible assets value of business acquired			31,800
Goodwill			38,400
Investments			76,500
Liabilities assumed			$ 43,200
B R C Restoration Specialists Inc
Business Acquisition [Line Items]
Purchase price				$ 8,000
Issuance of common stock for business acquisition, number of restricted common shares				79,850
Cash and stock, net of cash acquired				$ 6,000
Intangible assets value of business acquired				2,200
Goodwill				5,700
Issuance of common stock for business acquisition				$ 2,000
[1]	Goodwill largely consists of expected synergies and economies of scale resulting from the business combination

Business Acquisitions - Summary

Business Acquisitions - Summary of Preliminary Allocation of Purchase Price (Detail) - USD ($) $ in Thousands		Nov. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Purchase Consideration
Cash and stock, net of cash acquired			$ 140,919	$ 110,319	$ 6,000
Liabilities assumed
Goodwill			$ 152,459	$ 46,454	$ 8,028
NBIC Holdings, Inc [Member]
Purchase Consideration
Cash and stock, net of cash acquired		$ 180,919
Assets acquired
Investments		101,215
Premiums and agent's receivable		24,127
Other assets		13,173
Prepaid reinsurance premiums		137,378
Reinsurance recoverable on paid and unpaid claims		73,073
Total assets acquired		430,206
Liabilities assumed
Unpaid losses and loss adjustment expenses		93,804
Unearned premiums		175,050
Reinsurance payable		16
Deferred revenue		57,809
Accounts payable		12,913
Other liabilities assumed		15,701
Total liabilities assumed		355,293
Net assets acquired		74,914
Goodwill	[1]	106,005
Total purchase price, net of cash acquired		180,919
NBIC Holdings, Inc [Member] | Primarily Value Of Business Acquired [Member]
Assets acquired
Intangible assets		$ 81,240
[1]	Goodwill largely consists of expected synergies and economies of scale resulting from the business combination

Business Acquisitions - Summa51

Business Acquisitions - Summary of Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
NBIC Holdings, Inc [Member]
Business Acquisition [Line Items]
Revenue	$ 456,560	$ 511,663
Net income	$ 13,844	$ 42,397
Basic, earnings per share	$ 0.48	$ 1.33
Diluted, earnings per share	$ 0.47	$ 1.33
ZAC Business Acquisition [Member]
Business Acquisition [Line Items]
Revenue		$ 447,780	$ 432,070
Net income		$ 36,817	$ 104,722
Basic, earnings per share		$ 1.24	$ 3.48
Diluted, earnings per share		$ 1.24	$ 3.45

Business Acquisitions - Summa52

Business Acquisitions - Summary of Acquired Operations Included within Our Consolidated Statement of Operations (Detail) - NBIC Holdings, Inc [Member] $ in Thousands	1 Months Ended
	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Total revenue	$ 5,475
Net income	$ 9,121

Investments - Schedule of Amort

Investments - Schedule of Amortized Cost and Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	$ 552,458	$ 576,911
Gross Unrealized Gains	1,440	2,143
Gross Unrealized Losses	4,433	10,262
Fair Value	567,013	602,982
Investments	570,006	611,101
Fair Value	567,013	602,982
Fixed Maturities Excluding Certificate of Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	552,458	576,911
Gross Unrealized Gains	1,307	906
Gross Unrealized Losses	3,969	6,806
Fair Value	549,796	571,011
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	17,548	34,190
Gross Unrealized Gains	133	1,237
Gross Unrealized Losses	464	3,456
Fair Value	17,217	31,971
U.S. government and agency securities [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	39,445	107,968
Gross Unrealized Gains	7	29
Gross Unrealized Losses	572	449
Fair Value	38,880	107,548
States, Municipalities and Political Subdivisions [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	76,876	281,935
Gross Unrealized Gains	104	298
Gross Unrealized Losses	569	4,872
Fair Value	76,411	277,361
Special Revenue [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	269,277	53,726
Gross Unrealized Gains	524	29
Gross Unrealized Losses	2,124	759
Fair Value	267,677	52,996
Industrial and Miscellaneous [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	162,093	129,687
Gross Unrealized Gains	668	535
Gross Unrealized Losses	633	577
Fair Value	162,128	129,645
Redeemable Preferred Stocks [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	4,767	3,595
Gross Unrealized Gains	4	15
Gross Unrealized Losses	71	149
Fair Value	4,700	3,461
Nonredeemable Preferred Stocks [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	14,450	14,935
Gross Unrealized Gains	69	40
Gross Unrealized Losses	195	460
Fair Value	14,324	14,515
Common Stock [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost or Adjusted / Amortized Cost	3,098	19,255
Gross Unrealized Gains	64	1,197
Gross Unrealized Losses	269	2,996
Fair Value	$ 2,893	$ 17,456

Investments - Schedule of Reali

Investments - Schedule of Realized Gains (Losses) by Major Investment Category (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Total realized gains	$ 4,863	$ 2,890
Total realized losses	(4,299)	(1,157)
Net realized gains	564	1,733	$ 1,508
Total realized gains, Fair Value at Sale	736,369	79,065
Total realized losses, Fair Value at Sale	68,160	20,594
Net realized gains, Fair Value at Sale	804,529	99,659
Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Total realized gains	2,732	2,782
Total realized losses	(363)	(253)
Total realized gains, Fair Value at Sale	705,138	70,728
Total realized losses, Fair Value at Sale	56,354	15,496
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total realized gains	2,131	108
Total realized losses	(3,936)	(904)
Total realized gains, Fair Value at Sale	31,231	8,337
Total realized losses, Fair Value at Sale	$ 11,806	$ 5,098

Investments - Schedule of Amo55

Investments - Schedule of Amortized Cost and Fair Value of Investment Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Investments Debt And Equity Securities [Abstract]
Due in one year or less, Cost or Amortized Cost	$ 81,783	$ 158,517
Due after one year through five years, Cost or Amortized Cost	169,452	173,221
Due after five years through ten years, Cost or Amortized Cost	154,400	145,299
Due after ten years, Cost or Amortized Cost	146,823	99,874
Cost or Adjusted / Amortized Cost	$ 552,458	$ 576,911
Due in one year or less, Percentage of Total	15.00%	28.00%
Due after one year through five years, Percentage of Total	31.00%	30.00%
Due after five years through ten years, Percentage of Total	28.00%	25.00%
Due after ten years, Percentage of Total	26.00%	17.00%
Total, Percentage	100.00%	100.00%
Due in one year or less, Fair Value	$ 81,668	$ 158,496
Due after one year through five years, Fair Value	168,671	172,309
Due after five years through ten years, Fair Value	153,463	142,259
Due after ten years, Fair Value	145,994	97,947
Total, Fair Value	$ 549,796	$ 571,011
Due in one year or less, Percentage of Total	15.00%	28.00%
Due after one year through five years, Percentage of Total	31.00%	30.00%
Due after five years through ten years, Percentage of Total	28.00%	25.00%
Due after ten years, Percentage of Total	26.00%	17.00%
Total, Percentage	100.00%	100.00%

Investments - Summary of Net In

Investments - Summary of Net Investment Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	$ 13,447	$ 10,911	$ 9,289
Investment expenses	2,115	1,730	1,868
Net investment income, less investment expenses	11,332	9,181	7,421
Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	10,368	8,709	6,960
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	1,922	1,955	1,811
Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	960	226	258
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross investment income (loss)	$ 197	$ 21	$ 259

Investments - Aging of Gross Un

Investments - Aging of Gross Unrealized Investment Losses (Detail) $ in Thousands	Dec. 31, 2017USD ($)Security	Dec. 31, 2016USD ($)Security
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	862	772
Gross Unrealized Losses, Less Than Twelve Months	$ 2,096	$ 7,292
Fair Value, Less Than Twelve Months	$ 306,045	$ 362,656
Number of Securities, Twelve Months or Greater | Security	288	52
Gross Unrealized Losses, Twelve Months or Greater	$ 2,337	$ 2,970
Fair Value, Twelve Months or Greater	$ 102,259	$ 12,262
Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	724	669
Gross Unrealized Losses, Less Than Twelve Months	$ 1,862	$ 6,662
Fair Value, Less Than Twelve Months	$ 295,321	$ 348,816
Number of Securities, Twelve Months or Greater | Security	270	18
Gross Unrealized Losses, Twelve Months or Greater	$ 2,107	$ 145
Fair Value, Twelve Months or Greater	$ 101,005	$ 4,711
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	138	103
Gross Unrealized Losses, Less Than Twelve Months	$ 234	$ 630
Fair Value, Less Than Twelve Months	$ 10,724	$ 13,840
Number of Securities, Twelve Months or Greater | Security	18	34
Gross Unrealized Losses, Twelve Months or Greater	$ 230	$ 2,825
Fair Value, Twelve Months or Greater	$ 1,254	$ 7,551
U.S. government and agency securities [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	53	35
Gross Unrealized Losses, Less Than Twelve Months	$ 284	$ 448
Fair Value, Less Than Twelve Months	$ 20,053	$ 24,649
Number of Securities, Twelve Months or Greater | Security	24	2
Gross Unrealized Losses, Twelve Months or Greater	$ 289	$ 1
Fair Value, Twelve Months or Greater	$ 9,294	$ 200
States, Municipalities and Political Subdivisions [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	51	265
Gross Unrealized Losses, Less Than Twelve Months	$ 359	$ 4,869
Fair Value, Less Than Twelve Months	$ 49,803	$ 220,034
Number of Securities, Twelve Months or Greater | Security	8	2
Gross Unrealized Losses, Twelve Months or Greater	$ 210	$ 3
Fair Value, Twelve Months or Greater	$ 10,503	$ 1,497
Industrial and Miscellaneous [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	284	161
Gross Unrealized Losses, Less Than Twelve Months	$ 376	$ 571
Fair Value, Less Than Twelve Months	$ 87,898	$ 56,996
Number of Securities, Twelve Months or Greater | Security	38	2
Gross Unrealized Losses, Twelve Months or Greater	$ 256	$ 6
Fair Value, Twelve Months or Greater	$ 11,788	$ 974
Special Revenue [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	295	189
Gross Unrealized Losses, Less Than Twelve Months	$ 777	$ 631
Fair Value, Less Than Twelve Months	$ 133,580	$ 44,712
Number of Securities, Twelve Months or Greater | Security	183	11
Gross Unrealized Losses, Twelve Months or Greater	$ 1,347	$ 129
Fair Value, Twelve Months or Greater	$ 69,359	$ 1,828
Redeemable Preferred Stocks [Member] | Fixed Maturity [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	41	19
Gross Unrealized Losses, Less Than Twelve Months	$ 66	$ 143
Fair Value, Less Than Twelve Months	$ 3,987	$ 2,425
Number of Securities, Twelve Months or Greater | Security	17	1
Gross Unrealized Losses, Twelve Months or Greater	$ 5	$ 6
Fair Value, Twelve Months or Greater	$ 61	$ 212
Nonredeemable Preferred Stocks [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	127	77
Gross Unrealized Losses, Less Than Twelve Months	$ 188	$ 439
Fair Value, Less Than Twelve Months	$ 10,047	$ 11,298
Number of Securities, Twelve Months or Greater | Security	6	5
Gross Unrealized Losses, Twelve Months or Greater	$ 7	$ 20
Fair Value, Twelve Months or Greater	$ 159	$ 234
Common Shares [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities, Less Than Twelve Months | Security	11	26
Gross Unrealized Losses, Less Than Twelve Months	$ 46	$ 191
Fair Value, Less Than Twelve Months	$ 677	$ 2,542
Number of Securities, Twelve Months or Greater | Security	12	29
Gross Unrealized Losses, Twelve Months or Greater	$ 223	$ 2,805
Fair Value, Twelve Months or Greater	$ 1,095	$ 7,317

Goodwill and Other Intangible58

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 152,459,000	$ 46,454,000	$ 8,028,000
Intangibles, net	101,626,000	26,542,000
Indefinite lived intangible, insurance licenses	1,300,000	175,000
Amortization of intangible assets	$ 6,200,000	$ 7,400,000
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful lives	1 year
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets useful lives	15 years

Goodwill and Other Intangible59

Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 46,454	$ 8,028
Goodwill acquired	106,005	38,426
Ending balance	$ 152,459	$ 46,454

Goodwill and Other Intangible60

Goodwill and Other Intangible Assets - Schedule of Amortizing and Non-amortizing Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible assets, Gross Carrying Amount	$ 113,970		$ 33,870
Amortizing intangible assets, Accumulated Amortization	(13,659)		(7,503)
Intangible Assets, net	$ 100,311	[1]	$ 26,367	[2]
Minimum [Member]
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible aseets, Weighted - average Amortization (years)	1 year
Maximum [Member]
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible aseets, Weighted - average Amortization (years)	15 years
Brand [Member]
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible aseets, Weighted - average Amortization (years)	14 years		15 years
Amortizing intangible assets, Gross Carrying Amount	$ 1,210		$ 1,210
Amortizing intangible assets, Accumulated Amortization	(195)		(114)
Intangible Assets, net	$ 1,015	[1]	$ 1,096	[2]
Agent Relationships [Member]
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible aseets, Weighted - average Amortization (years)	10 years		12 years
Amortizing intangible assets, Gross Carrying Amount	$ 15,500		$ 4,800
Amortizing intangible assets, Accumulated Amortization	(789)		(300)
Intangible Assets, net	$ 14,711	[1]	$ 4,500	[2]
Renewal Rights [Member]
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible aseets, Weighted - average Amortization (years)	15 years		15 years
Amortizing intangible assets, Gross Carrying Amount	$ 57,200		$ 16,600
Amortizing intangible assets, Accumulated Amortization	(2,162)		(830)
Intangible Assets, net	$ 55,038	[1]	$ 15,770	[2]
Customer Relations [Member]
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible aseets, Weighted - average Amortization (years)	8 years		10 years
Amortizing intangible assets, Gross Carrying Amount	$ 870		$ 870
Amortizing intangible assets, Accumulated Amortization	(211)		(123)
Intangible Assets, net	$ 659	[1]	$ 747	[2]
Trade Names [Member]
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible aseets, Weighted - average Amortization (years)	10 years		10 years
Amortizing intangible assets, Gross Carrying Amount	$ 9,000		$ 2,000
Amortizing intangible assets, Accumulated Amortization	(408)		(150)
Intangible Assets, net	$ 8,592	[1]	$ 1,850	[2]
Value of Business Acquired [Member]
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible aseets, Weighted - average Amortization (years)	1 year		1 year
Amortizing intangible assets, Gross Carrying Amount	$ 25,400		$ 7,600
Amortizing intangible assets, Accumulated Amortization	(9,083)		(5,700)
Intangible Assets, net	$ 16,317	[1]	$ 1,900	[2]
Non-compete [Member]
Schedule of Finite-Lived and Indefinite-Lived Assets [Line Items]
Amortizing intangible aseets, Weighted - average Amortization (years)	2 years		2 years 6 months
Amortizing intangible assets, Gross Carrying Amount	$ 4,790		$ 790
Amortizing intangible assets, Accumulated Amortization	(811)		(286)
Intangible Assets, net	$ 3,979	[1]	$ 504	[2]
[1]	Excludes insurance license valued at $1.3 million and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized.
[2]	Excludes insurance license valued at $175,000 and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized

Goodwill and Other Intangible61

Goodwill and Other Intangible Assets - Schedule of Finite-lived Intangible Assets (Parenthetical) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Indefinite lived intangible, insurance license	$ 1,300,000	$ 175,000

Goodwill and Other Intangible62

Goodwill and Other Intangible Assets - Schedule of Estimated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017		Dec. 31, 2016	[2]
Goodwill And Intangible Assets Disclosure [Abstract]
2,018	$ 24,776
2,019	8,208
2,020	6,365
2,021	6,351
2,022	6,351
Thereafter	48,260
Intangible Assets, net	$ 100,311	[1]	$ 26,367
[1]	Excludes insurance license valued at $1.3 million and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized.
[2]	Excludes insurance license valued at $175,000 and classified as an indefinite lived intangible which is subject to annual impairment testing and not amortized

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Computation of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic earnings per share:
Net (loss) income attributable to common stockholders (000's)									$ (1,119)	$ 33,865	$ 92,512
Weighted average shares outstanding									26,798,465	29,632,171	30,056,491
Basic (loss) earnings per share:	$ (0.18)	$ (0.34)	$ 0.23	$ 0.21	$ (0.09)	$ 0.37	$ 0.62	$ 0.24	$ (0.04)	$ 1.14	$ 3.08
Diluted earnings per share:
Net (loss) income attributable to common stockholders (000's)									$ (1,119)	$ 33,865	$ 92,512
Weighted average shares outstanding									26,798,465	29,632,171	30,056,491
Weighted average dilutive shares										2,178	269,977
Total weighted average dilutive shares									26,798,465	29,634,349	30,326,468
Diluted (loss) earnings per share:	$ (0.18)	$ (0.34)	$ 0.23	$ 0.21	$ (0.09)	$ 0.37	$ 0.62	$ 0.24	$ (0.04)	$ 1.14	$ 3.05

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Number of antidilutive shares	8,424,598	2,049,923	2,274,923

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value Measurements (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	$ 549,796	$ 571,011
Available for sale equity securities	17,217	31,971
Available for sale securities	567,013	602,982
Nonredeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	14,324	14,515
Equity Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	2,893	17,456
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	359	107,458
Available for sale equity securities	17,217	31,971
Available for sale securities	17,576	139,429
Level 1 [Member] | Nonredeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	14,324	14,515
Level 1 [Member] | Equity Investment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale equity securities	2,893	17,456
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	549,437	463,553
Available for sale securities	549,437	463,553
Fixed Maturity [Member] | U.S. government and agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	38,880	107,548
Available for sale securities	38,880	107,548
Fixed Maturity [Member] | States, Municipalities and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	76,411	277,361
Available for sale securities	76,411	277,361
Fixed Maturity [Member] | Special Revenue [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	267,677	52,996
Available for sale securities	267,677	52,996
Fixed Maturity [Member] | Industrial and Miscellaneous [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	162,128	129,645
Available for sale securities	162,128	129,645
Fixed Maturity [Member] | Redeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	4,700	3,461
Available for sale securities	4,700	3,461
Fixed Maturity [Member] | Level 1 [Member] | U.S. government and agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	359	103,997
Fixed Maturity [Member] | Level 1 [Member] | Redeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities		3,461
Fixed Maturity [Member] | Level 2 [Member] | U.S. government and agency securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	38,521	3,551
Fixed Maturity [Member] | Level 2 [Member] | States, Municipalities and Political Subdivisions [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	76,411	277,361
Fixed Maturity [Member] | Level 2 [Member] | Special Revenue [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	267,677	52,996
Fixed Maturity [Member] | Level 2 [Member] | Industrial and Miscellaneous [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	162,128	$ 129,645
Fixed Maturity [Member] | Level 2 [Member] | Redeemable Preferred Stocks [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Available for sale debt securities	$ 4,700

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value measurement period	1 year
Nonrecurring [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Non-recurring fair value adjustments	$ 0	$ 0	$ 0

Property and Equipment - Schedu

Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total, at cost	$ 24,057	$ 20,931
Less: accumulated depreciation and amortization	5,309	3,752
Property and equipment, net	18,748	17,179
Land [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	2,582	2,582
Building [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	12,148	10,301
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	4,093	3,113
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	759	759
Tenant and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	3,660	3,334
Vehicle Fleet [Member]
Property, Plant and Equipment [Line Items]
Total, at cost	$ 815	$ 842

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)aft²Building	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Property Plant And Equipment Useful Life And Values [Abstract]
Depreciation and amortization expense | $	$ 1.6	$ 1.6	$ 1.3
Number of acres of land purchased | a	15
Number of buildings | Building	5
Gross area of acquired property | ft²	229,000

Property and Equipment - Sche69

Property and Equipment - Schedule of Expected Annual Rental Income Due Under Non-Cancellable Operating Leases for Real Estate Properties (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Property Plant And Equipment [Abstract]
January 1 to December 31, 2018	$ 2,458
January 1 to December 31, 2019	2,461
January 1 to December 31, 2020	2,521
January 1 to December 31, 2021	2,581
January 1 to December 31, 2022	2,636
Thereafter	2,063
Total rental income due under non-cancellable operating leases	$ 14,720

Deferred Policy Acquisition C70

Deferred Policy Acquisition Costs - Summary of Activity in Deferred Policy Acquisition Costs (DPAC) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Insurance [Abstract]
Beginning Balance	$ 42,779	$ 34,800
Policy acquisition costs incurred	82,791	92,400
Amortization	(83,892)	(84,421)	$ (57,186)
Ending Balance	$ 41,678	$ 42,779	$ 34,800

Reinsurance - Additional inform

Reinsurance - Additional information (Detail)	Feb. 29, 2016USD ($)	Apr. 30, 2015USD ($)	May 31, 2017USD ($)	Mar. 31, 2017USD ($)	Apr. 30, 2015USD ($)	Dec. 31, 2017USD ($)Reinsurer	Jun. 30, 2017USD ($)Reinsurer	Dec. 31, 2017USD ($)ReinsurerReinsuranceLayer	Dec. 31, 2016USD ($)Reinsurer	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Number of reinstatements available | Reinsurer						2			2
Primary retention									$ 3,100,000,000
Percentage comprising aggregate participation									5.40%
Primary retention of losses and loss adjustment expenses									$ 190,000,000
Aggregate participation, losses and loss adjustment expenses								$ 12,567,000	18,791,000	$ (5,293,000)
Purchase of reinsurance from third party								263,740,000	228,797,000	148,472,000
Agreement of coverage	3 years
Additional maturity period of collateral notes	2 years				2 years
Reinsurance agreement	3 years
Prepaid reinsurance premiums						$ 227,764,000		227,764,000	106,609,000
Net of prepaid reinsurance premium as attachment point						357,357,000		357,357,000
Unpaid losses and loss adjustment expenses						470,083,000		470,083,000	140,137,000	83,722,000	$ 51,469,000
Reinsurance payable						$ 17,577,000		$ 17,577,000	96,667,000
Reinsurer Concentration Risk [Member] | Reinsurance Recoverable Including Reinsurance Premium Paid [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Concentration risk premium written								10.00%
NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention								$ 1,000,000,000
Catastrophe excess of loss reinsurance								$ 18,500,000
Percentage of aggregate contract						25.00%		25.00%
Aggregate contract expiration date								May 31, 2018
Aggregate contract coverage limit								$ 13,500,000
Franchise deductible amount								$ 1,000,000
Hartford Steam Boiler [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage comprising aggregate participation								100.00%
Insurance Claims [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Unpaid losses and loss adjustment expenses						$ 1,000,000		$ 1,000,000
Notes Due February 2019 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust	$ 250,000,000
Class D Notes Due February 2019 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust	150,000,000
Class E Notes Due February 2019 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust	$ 100,000,000
Second Catastrophic Event [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Number reinsurance reinstatement provisions | Reinsurer								1
Percentage of reinsurance reinstatement provisions premium								100.00%
Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party										2,300,000,000
Reinsurance purchase limit						632,000,000		$ 632,000,000	860,000,000
Reinsurance prepaid amount									825,000,000
Catastrophe [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention of losses and loss adjustment expenses						1,300,000		1,300,000
Catastrophe [Member] | 2014 Class A Notes [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust											200,000,000
Additional coverage of second catastrophe reinsurance agreement											$ 50,000,000
Reinsurance agreement											3 years
Coverage of first catastrophe reinsurance agreement											$ 150,000,000
Aggregate Excess For All Catastrophe Losses Excluding Named Tropical Storms [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance payable						20,000,000		20,000,000
Named Tropical Storm Losses [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance payable						12,000,000		$ 12,000,000
Maximum [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate participation, losses and loss adjustment expenses									11,600,000
Purchased reinstatement premium									$ 5,300,000
Minimum [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Notes maturity period								90 days
Minimum [Member] | Aggregate Excess For All Catastrophe Losses Excluding Named Tropical Storms [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Limit of aggregate losses under aggregate contract								$ 21,500,000
Minimum [Member] | Named Tropical Storm Losses [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance loss limit								8,000,000
Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention of losses and loss adjustment expenses										35,000,000
Coverage limit								9,000,000
Reinsurance payable						27,000,000		27,000,000
Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium										440,000,000
Unpaid losses and loss adjustment expenses										$ 1,800,000,000
FHCF Layer [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage comprising aggregate participation									45.00%	75.00%
Catastrophe excess of loss reinsurance									$ 460,000,000	$ 336,000,000
Percentage of maximum provisional limit									45.00%	75.00%
Estimated provisional limit percentage calculation base amount									$ 1,500,000,000	$ 920,000,000
FHCF Layer [Member] | Property Per Risk Coverage [Member] | Maximum [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Estimated maximum provisional limit, amount										690,000,000
Shared Layers [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party								372,000,000
Shared coverage amount available subject to seasonal aggregate								20,000,000
Seasonal aggregate amount								68,000,000
Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Coverage of first catastrophe reinsurance agreement									282,000,000
Prepaid reinsurance premiums									260,000,000
Aggregate Coverage [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate participation, losses and loss adjustment expenses										1,700,000,000
Purchase of reinsurance from third party										125,000,000
Purchased reinstatement premium								700,000,000	682,000,000
Prepaid reinsurance premiums						632,000,000		632,000,000	$ 460,000,000
Top Hawaii Only Layer [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party								$ 26,000,000
2017 - 2018 Reinsurance Program [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Number of reinstatements available | Reinsurer								2
2017 - 2018 Reinsurance Program [Member] | Insurance Claims [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Unpaid losses and loss adjustment expenses						1,000,000		$ 1,000,000
2017 - 2018 Reinsurance Program [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party								$ 2,600,000,000
Description of hurricane losses coverage and protection								Hurricane losses in states other than Hawaii would be covered under the Heritage P&C program with the exception of the FHCF coverage and the series 2015, 2016 and 2017 catastrophe bonds. Management deemed this reinsurance protection to be sufficient given the level of catastrophe exposure in 2017 for Alabama, Georgia, North Carolina and South Carolina.
2017 - 2018 Reinsurance Program [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Coverage limit								$ 9,000,000
Reinsurance payable						27,000,000		27,000,000
Facultative Reinsurance | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance loss limit								2,500,000
Facultative Reinsurance | Maximum [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance payable						10,000,000		10,000,000
Facultative Reinsurance | Minimum [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Facultative reinsurance purchase amount						10,000,000		10,000,000
Facultative Reinsurance | Minimum [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance payable						3,500,000		$ 3,500,000
Gross Quota Share [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage of gross quota share								18.75%
Reinsurance recoveries on paid losses						$ 1,000,000,000		$ 1,000,000,000
Gross Quota Share [Member] | Second Catastrophic Event [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage of gross quota share								81.25%
Percentage of remaining gross quota share								18.75%
Net Quota Share [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Net lines quota share occurrence limit								$ 20,000,000
Percentage of ceded net premium and losses						60.00%		60.00%	8.00%
Percentage of renewed ceded net premium and losses						49.50%		49.50%
Net Quota Share [Member] | Second Catastrophic Event [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reduction in reinsurance reinstatement net retention amount								$ 20,000,000
General Excess of Loss [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention								$ 300,000,000
Number of loss applied to reinsurance contract | Reinsurance								1
Number of layers in excess of rentention loss | Layer								2
General Excess of Loss [Member] | First Layer Coverage [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention								$ 450,000,000
Catastrophe excess of loss reinsurance								300,000,000
General Excess of Loss [Member] | Second Layer Coverage [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention								2,750,000
Catastrophe excess of loss reinsurance								750,000,000
General Excess of Loss [Member] | Casualty Second Layer [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention								1,250,000
Catastrophe excess of loss reinsurance								$ 750,000,000
General Excess of Loss [Member] | First and Second Layer Coverage [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage of gross quota share								81.25%
Additional coverage percentage of gross quota share								18.75%
Umbrella Facultative Reinsurance [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage of quota share								90.00%
Additional percentage of quota share								100.00%
Umbrella Facultative Reinsurance [Member] | Maximum [Member] | NBIC [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Limits of liability						$ 1,000,000		$ 1,000,000
Additional limits of liability						4,000,000		4,000,000
Shared Layers Above Retention And Below FHCF [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party									$ 374,000,000
Layers Below FHCF [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party										$ 440,000,000
2016-2017 Reinsurance Program [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party									3,000,000,000
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Agreement of coverage										3 years
Reinsurance agreement										3 years
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Class B Notes Due April 2017 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		$ 97,500,000			$ 97,500,000
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Class C Notes Due April 2017 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		30,000,000			30,000,000
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Class A Notes Due April Two Thousand Seventeen [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		150,000,000			150,000,000
Cat Bond Layer Alongside FHCF [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Notes Due April 2017 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		$ 277,500,000			277,500,000
Florida [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention									1,900,000,000
Primary retention of losses and loss adjustment expenses									40,000,000
Florida [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Unpaid losses and loss adjustment expenses						1,750,000,000		1,750,000,000	1,900,000,000
Florida [Member] | Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium									260,000,000
Florida [Member] | A Top And Drop Multi-Zonal Layer [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium									22,000,000
Hawaii [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention									1,100,000,000
Primary retention of losses and loss adjustment expenses									30,000,000
Hawaii [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Unpaid losses and loss adjustment expenses						731,000,000		731,000,000	1,100,000,000
Hawaii [Member] | Shared Layers [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party								372,000,000
Shared coverage amount available subject to seasonal aggregate								20,000,000
Seasonal aggregate amount								68,000,000
Hawaii [Member] | Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium									260,000,000
Hawaii [Member] | A Top And Drop Multi-Zonal Layer [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium									22,000,000
Heritage P&C and Zephyr [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Number of reinstatements available | Reinsurer							2
Primary retention							$ 2,600,000,000
Primary retention of losses and loss adjustment expenses						20,000,000		20,000,000
Unpaid losses and loss adjustment expenses						376,194,000		$ 376,194,000
Heritage P&C and Zephyr [Member] | FHCF Layer [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage comprising aggregate participation								45.00%
Heritage P&C and Zephyr [Member] | Shared Layers [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium								$ 352,000,000
Heritage P&C and Zephyr [Member] | Florida [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention							1,750,000,000
Heritage P&C and Zephyr [Member] | Hawaii [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention							$ 731,000,000
Heritage P&C and Zephyr [Member] | Hawaii [Member] | Shared Layers [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium								352,000,000
Heritage P&C [Member] | Two Thousand Fifteen Class B And C Notes [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Agreement of coverage		3 years
Heritage P&C [Member] | Class B Notes Due April 2017 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		$ 97,500,000			97,500,000
Heritage P&C [Member] | Class C Notes Due April 2017 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		30,000,000			30,000,000
Heritage P&C [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention										$ 5,000,000
Catastrophe excess of loss reinsurance										5,000,000
Heritage P&C [Member] | Layers Below FHCF [Member] | Class A Notes Due April Two Thousand Seventeen [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		$ 150,000,000			$ 150,000,000
Agreement of coverage					3 years
Reinsurance agreement					3 years
Heritage P&C [Member] | Florida [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention									15,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention								$ 16,000,000
Percentage comprising aggregate participation								20.00%
Primary retention of losses and loss adjustment expenses						20,000,000		$ 20,000,000
Catastrophe excess of loss reinsurance								$ 16,000,000
Agreement of coverage	3 years		3 years
Additional maturity period of collateral notes	2 years		2 years
Reinsurance agreement	3 years		3 years
Heritage P&C [Member] | States Other Than Hawaii [Member] | Notes Due March 2020 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust			$ 35,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Notes Due February 2019 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust	$ 250,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Class D Notes Due February 2019 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust	150,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Class E Notes Due February 2019 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust	$ 100,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Two Thousand Fifteen Class B And C Notes [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Agreement of coverage		3 years
Heritage P&C [Member] | States Other Than Hawaii [Member] | Class B Notes Due April 2017 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		$ 97,500,000			$ 97,500,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Class C Notes Due April 2017 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		30,000,000			30,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | First Catastrophic Event [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage comprising aggregate participation								20.00%
Primary retention of losses and loss adjustment expenses						878,000,000		$ 878,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Second Catastrophic Event [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage comprising aggregate participation								11.50%
Primary retention of losses and loss adjustment expenses						420,000,000		$ 420,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Top and Aggregate Layer [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention of losses and loss adjustment expenses						15,000,000		15,000,000
Aggregate participation, losses and loss adjustment expenses								5,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Maximum [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate participation, losses and loss adjustment expenses								36,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Maximum [Member] | First Catastrophic Event [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate participation, losses and loss adjustment expenses								727,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | FHCF Layer [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Catastrophe excess of loss reinsurance								$ 414,000,000
Percentage of maximum provisional limit								45.00%
Estimated provisional limit percentage calculation base amount								$ 1,300,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Layers Above FHCF -Florida Program [Member] | 2017-1 Notes [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust				$ 125,000,000
Agreement of coverage				3 years
Additional maturity period of collateral notes				2 years
Reinsurance agreement				3 years
Heritage P&C [Member] | States Other Than Hawaii [Member] | Layers Above FHCF -Florida Program [Member] | Class A Notes Due April Two Thousand Seventeen [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust		$ 150,000,000			$ 150,000,000
Agreement of coverage					3 years
Additional maturity period of collateral notes					2 years
Reinsurance agreement					3 years
Heritage P&C [Member] | States Other Than Hawaii [Member] | Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Coverage of first catastrophe reinsurance agreement								254,000,000
Heritage P&C [Member] | States Other Than Hawaii [Member] | Aggregate Coverage [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium								984,000,000
Prepaid reinsurance premiums						606,000,000		606,000,000
Net of prepaid reinsurance premium as attachment point						40,000,000		40,000,000
Citrus [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Two Thousand Fifteen C And B Series Bond And Two Thousand Sixteen Bond [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust									377,500,000
Additional coverage of second catastrophe reinsurance agreement									200,000,000
Citrus [Member] | Cat Bond Layer Above FHCF [Member] | Property Per Risk Coverage [Member] | Class A Notes [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust										150,000,000
Additional coverage of second catastrophe reinsurance agreement										50,000,000
Coverage of first catastrophe reinsurance agreement										150,000,000
Citrus [Member] | States Other Than Hawaii [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member] | Two Thousand Fifteen C And C Series Bond And Two Thousand Sixteen D and E Bond And Two Thousand Seventeen Two Bond [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Collateralized by a reinsurance trust						412,500,000		412,500,000
Additional coverage of second catastrophe reinsurance agreement								5,000,000
Zephyr [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Catastrophe excess of loss reinsurance									5,000,000
Zephyr [Member] | Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Coverage of first catastrophe reinsurance agreement								302,000,000
Prepaid reinsurance premiums						254,000,000		254,000,000
Zephyr [Member] | Florida [Member] | Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium								254,000,000
Zephyr [Member] | Florida [Member] | A Top And Aggregate Multi Zonal Layer [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium								48,000,000
Zephyr [Member] | Hawaii [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention								16,000,000	5,000,000
Primary retention of losses and loss adjustment expenses						20,000,000		20,000,000
Catastrophe excess of loss reinsurance								$ 16,000,000
Zephyr [Member] | Hawaii [Member] | First Catastrophic Event [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage comprising aggregate participation								3.80%
Primary retention of losses and loss adjustment expenses						386,000,000		$ 386,000,000
Zephyr [Member] | Hawaii [Member] | Second Catastrophic Event [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage comprising aggregate participation								117.70%
Primary retention of losses and loss adjustment expenses						386,000,000		$ 386,000,000
Zephyr [Member] | Hawaii [Member] | Top and Aggregate Layer [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention of losses and loss adjustment expenses						$ 15,000,000		15,000,000
Aggregate participation, losses and loss adjustment expenses								5,000,000
Zephyr [Member] | Hawaii [Member] | Maximum [Member] | First Catastrophic Event [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate participation, losses and loss adjustment expenses								12,000,000
Zephyr [Member] | Hawaii [Member] | Maximum [Member] | Second Catastrophic Event [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Aggregate participation, losses and loss adjustment expenses								56,000,000
Zephyr [Member] | Hawaii [Member] | Multi-Zonal Layers [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium								254,000,000
Zephyr [Member] | Hawaii [Member] | A Top And Aggregate Multi Zonal Layer [Member] | Property Per Risk Coverage [Member] | Catastrophe [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchased reinstatement premium								$ 48,000,000
Citrus Re Ltd [Member] | 2017 - 2018 Reinsurance Program [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Percentage comprising aggregate participation								26.00%
Purchase of reinsurance from third party								$ 687,500,000
Coverage arrangements, period								multi-year
Citrus Re Ltd [Member] | 2017 - 2018 Reinsurance Program [Member] | Class A and B and C Due in May 2018 [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party								$ 277,500,000
Notes maturity date								May 31, 2018
Citrus Re Ltd [Member] | 2017 - 2018 Reinsurance Program [Member] | Class D and E Due in Two-year Period [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party								$ 250,000,000
Additional maturity period of collateral notes								2 years
Citrus Re Ltd [Member] | 2017 - 2018 Reinsurance Program [Member] | Notes Due in Three-year Period [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Purchase of reinsurance from third party								$ 160,000,000
Notes maturity period								3 years
Osprey [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Catastrophe excess of loss reinsurance									0
Osprey [Member] | Property Per Risk Coverage [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention										10,000,000
Primary retention of losses and loss adjustment expenses										$ 20,000,000
Osprey [Member] | Florida [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention of losses and loss adjustment expenses									20,000,000
Osprey [Member] | Hawaii [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Primary retention of losses and loss adjustment expenses									$ 15,000,000

Reserve for Unpaid Losses - Sum

Reserve for Unpaid Losses - Summary of Reserve for Unpaid Losses (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Insurance [Abstract]
Balance, beginning of period	$ 140,137	$ 83,722	$ 51,469
Less: reinsurance recoverable on unpaid losses	589	0	0
Less: reinsurance recoverable on unpaid losses	586	0
Net balance, beginning of period	139,548	83,722	51,469
Net balance, beginning of period	139,551	83,722
Incurred related to:
Current year	188,914	220,071	146,484
Prior years	12,567	18,791	(5,293)
Total incurred	201,481	238,862	141,191
Paid related to:
Current year	114,344	120,626	81,673
Prior years	107,479	62,407	27,265
Total paid	221,823	183,033	108,938
Total unpaid claims assumed from acquisitions	35,524
Net balance, end of period	154,730	139,548	83,722
Net balance, end of period		139,551	83,722
Plus: reinsurance recoverable on unpaid losses	315,353	589	0
Plus: reinsurance recoverable on unpaid losses		586	0
Balance, end of period	$ 470,083	$ 140,137	$ 83,722

Reserve for Unpaid Losses - Add

Reserve for Unpaid Losses - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Liability For Claims And Claims Adjustment Expense [Line Items]
Losses incurred related to the prior year (redundancy) and development	$ 12,567	$ 18,791	$ (5,293)
Hurricane Hermine and Matthew in 2017
Liability For Claims And Claims Adjustment Expense [Line Items]
Losses incurred related to the prior year (redundancy) and development	$ 6,500

Reserve for Unpaid Losses - S74

Reserve for Unpaid Losses - Summary of Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance (Detail) $ in Thousands	Dec. 31, 2017USD ($)Claim	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012USD ($)	Dec. 31, 2011USD ($)	Dec. 31, 2010USD ($)	Dec. 31, 2009USD ($)	Dec. 31, 2008USD ($)
Narragansett Bay Insurance Company And Pawtucket Insurance Company
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 241,428
Net IBNR Reserves	7,164
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2008 and Prior [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	1,483	$ 1,484	$ 1,485	$ 1,485	$ 1,485	$ 1,485	$ 1,576	$ 1,478	$ 1,502	$ 1,796
Net IBNR Reserves	$ 325
Reported Claims | Claim	233
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2012 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 52,884	52,482	52,364	53,051	51,778	48,175
Net IBNR Reserves	$ 84
Reported Claims | Claim	39,431
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2009 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 3,191	3,187	3,196	3,205	3,205	3,160	3,095	3,069	$ 3,664
Reported Claims | Claim	502
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2013 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 23,817	25,076	25,757	25,664	24,152
Net IBNR Reserves	$ 303
Reported Claims | Claim	9,464
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2010 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 11,547	11,559	11,547	11,538	11,417	11,083	11,217	$ 11,607
Net IBNR Reserves	$ 2
Reported Claims | Claim	2,160
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2014 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 26,561	27,213	28,391	27,152
Net IBNR Reserves	$ 917
Reported Claims | Claim	10,622
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2011 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 36,726	36,822	37,117	37,752	37,029	37,424	$ 35,433
Net IBNR Reserves	$ 6
Reported Claims | Claim	10,877
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2015 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 37,570	37,845	38,130
Net IBNR Reserves	$ 1,175
Reported Claims | Claim	14,377
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2016 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 30,071	30,024
Net IBNR Reserves	$ 1,844
Reported Claims | Claim	10,672
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2017 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 17,578
Net IBNR Reserves	$ 2,508
Reported Claims | Claim	10,576
Heritage P&C and Zephyr [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 678,130
Net IBNR Reserves	85,193
Heritage P&C and Zephyr [Member] | Accident Year 2012 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	823	797	784	811	851	$ 1,396
Net IBNR Reserves	$ 21
Reported Claims | Claim	134
Heritage P&C and Zephyr [Member] | Accident Year 2013 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 38,537	37,090	37,212	35,819	$ 37,005
Net IBNR Reserves	$ 1,220
Reported Claims | Claim	3,618
Heritage P&C and Zephyr [Member] | Accident Year 2014 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 88,423	86,634	86,508	$ 91,839
Net IBNR Reserves	$ 1,606
Reported Claims | Claim	7,801
Heritage P&C and Zephyr [Member] | Accident Year 2015 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 166,222	159,899	$ 141,125
Net IBNR Reserves	$ 9,466
Reported Claims | Claim	11,177
Heritage P&C and Zephyr [Member] | Accident Year 2016 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 212,540	$ 207,183
Net IBNR Reserves	$ 12,901
Reported Claims | Claim	15,613
Heritage P&C and Zephyr [Member] | Accident Year 2017 [Member]
Claims Development [Line Items]
Incurred Loss and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 171,585
Net IBNR Reserves	$ 59,979
Reported Claims | Claim	40,826

Reserve for Unpaid Losses - S75

Reserve for Unpaid Losses - Summary of Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Narragansett Bay Insurance Company And Pawtucket Insurance Company
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 227,045
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2012 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	51,735	$ 50,879	$ 50,558	$ 49,873	$ 49,422	$ 42,427
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2013 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	22,898	22,325	23,175	21,693	17,146
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2014 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	24,088	22,115	24,144	21,324
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2009 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	3,188	3,186	3,186	3,128	3,058	2,992	$ 2,788	$ 2,778	$ 1,794
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2015 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	34,484	32,387	27,608
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2010 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	11,333	11,336	11,309	11,024	10,792	10,418	10,194	8,589
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2016 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	27,115	24,908
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2011 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	36,683	36,711	36,800	36,546	35,953	35,575	28,767
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2017 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	14,038
Narragansett Bay Insurance Company And Pawtucket Insurance Company | Accident Year 2008 and Prior [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	1,483	1,484	1,484	1,484	1,483	1,485	$ 1,406	$ 1,319	$ 1,335	$ 1,047
Heritage P&C and Zephyr [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	542,244
Heritage P&C and Zephyr [Member] | Accident Year 2012 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	631	766	756	695	615	$ 12
Heritage P&C and Zephyr [Member] | Accident Year 2013 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	36,497	35,322	32,414	29,023	$ 18,625
Heritage P&C and Zephyr [Member] | Accident Year 2014 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	84,421	79,341	70,932	$ 47,408
Heritage P&C and Zephyr [Member] | Accident Year 2015 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	147,188	130,267	$ 76,310
Heritage P&C and Zephyr [Member] | Accident Year 2016 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	184,397	$ 107,771
Heritage P&C and Zephyr [Member] | Accident Year 2017 [Member]
Claims Development [Line Items]
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance	$ 89,110

Reserve for Unpaid Losses - S76

Reserve for Unpaid Losses - Summary of Reconciliation of Reserve Balances to Liability for Unpaid Loss and Loss Adjustment Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Ceded Unpaid Loss and Allocated Loss Adjustment Expense	$ 315,353	$ 589	$ 0	$ 0
Unpaid losses and loss adjustment expenses	470,083	$ 140,137	$ 83,722	$ 51,469
Narragansett Bay Insurance Company And Pawtucket Insurance Company
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Unpaid Loss and Allocated Loss Adjustment Expense, Net of Reinsurance	14,383
Ceded Unpaid Loss and Allocated Loss Adjustment Expense	76,845
Unpaid Unallocated Loss Adjustment Expense	2,661
Unpaid losses and loss adjustment expenses	93,889
Heritage P&C and Zephyr [Member]
Shortduration Insurance Contracts Reconciliation Of Claims Development To Liability [Line Items]
Unpaid Loss and Allocated Loss Adjustment Expense, Net of Reinsurance	135,886
Ceded Unpaid Loss and Allocated Loss Adjustment Expense	238,508
Unpaid Unallocated Loss Adjustment Expense	1,800
Unpaid losses and loss adjustment expenses	$ 376,194

Reserve for Unpaid Losses - S77

Reserve for Unpaid Losses - Summary of Average Annual Percentage Payout of Incurred Claims by Age, Net of Reinsurance (Detail)	Dec. 31, 2017
Narragansett Bay Insurance Company And Pawtucket Insurance Company
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 1	75.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 2	16.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 3	1.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 4	3.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 5	2.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 6	1.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 7	1.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 8	0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 9	0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 10	0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Thereafter	1.00%
Heritage P&C and Zephyr [Member]
Shortduration Insurance Contracts Historical Claims Duration [Line Items]
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 1	52.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 2	32.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 3	5.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 4	6.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Year - 5	0.00%
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance Thereafter	5.00%

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail)	Oct. 30, 2017USD ($)	Aug. 16, 2017USD ($)	Dec. 31, 2017USD ($)d	Dec. 31, 2016USD ($)	Dec. 01, 2017USD ($)	Nov. 14, 2017USD ($)	Sep. 07, 2017USD ($)	Dec. 15, 2016USD ($)Investor
Debt Instrument [Line Items]
Long-term debt			$ 207,782,000	$ 79,500,000
Net of issuance costs			184,405,000	72,905,000
Interest payments			$ 4,054,000
Debt discount and deferred issuance costs, amortization period			5 years
Trading price of the underlying secured note as percentage of par value			107.00%
Interest expense, net			$ 13,210,000	$ 362,000
Convertible Note [Member]
Debt Instrument [Line Items]
Embedded derivative converted to equity, liability			6,200,000
Reduction of debt			17,700,000
Net loss extinguishment of debt			$ 1,200,000
Heritage P&C [Member] | Convertible Note [Member]
Debt Instrument [Line Items]
Repurchase of convertible notes						$ 21,100,000
Debt instrument, premium						$ 25,200,000
Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term debt								$ 79,500,000
Number of accredited investors | Investor								6
Interest rate			8.75%
Frequency of periodic principal and interest payments			quarterly
Interest payment commencement date			Mar. 15, 2017
Principal payment commencement date			Dec. 31, 2018
Net of issuance costs			$ 73,700,000
Issuance costs			5,700,000
Interest payments			$ 8,000,000
Debt instrument redemption price in cash due to change in control, percentage			101.00%
Effective interest rate			10.00%
Senior Secured Notes [Member] | 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument redemption price, percentage			103.00%
Senior Secured Notes [Member] | 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument redemption price, percentage			102.00%
Senior Secured Notes [Member] | 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument redemption price, percentage			101.00%
Senior Secured Notes [Member] | Thereafter [Member]
Debt Instrument [Line Items]
Debt Instrument redemption price, percentage			100.00%
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Interest rate		5.875%
Debt Instrument redemption price, percentage			100.00%
Aggregate principal amount		$ 125,000,000					$ 11,750,000
Interest payments term		Interest accrues from August 16, 2017 and will be payable semi-annually in arrears, on February 1 and August 1 of each year, beginning on February 1, 2018.
Notes maturity date		Aug. 1, 2037
Debt instrument repurchase price due to fundamental change, percentage			100.00%
Principal amount of each convertible note			$ 1,000
Debt instrument convertible conversion accrued and unpaid interest			$ 1,010
Debt instrument convertible, if redeemed percentage in excess of initial conversion			75.00%
Sinking fund for convertible notes			$ 0
Debt event of default, minimum percentage of notice to note holders			25.00%
Debt instrument covenant, principal, accrued and unpaid interest due and payable, percentage			100.00%
Change in fair value of long-term debt conversion feature			$ 41,000,000
Maturity date		Aug. 1, 2037
Convertible Senior Notes [Member] | Additional Paid-In Capital [Member]
Debt Instrument [Line Items]
Embedded derivative converted to equity, liability					$ 51,600,000
Convertible Senior Notes [Member] | Debt Redemption Period One [Member]
Debt Instrument [Line Items]
Convertible debt, threshold trading days | d			20
Convertible debt, threshold consecutive trading days | d			30
Convertible debt, threshold percentage of stock price trigger			130.00%
Convertible Senior Notes [Member] | Debt Redemption Period Two [Member]
Debt Instrument [Line Items]
Convertible debt, threshold trading days | d			10
Convertible debt, threshold consecutive trading days | d			5
Convertible debt, threshold percentage of stock price trigger			98.00%
Convertible Senior Notes [Member] | August 1, 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument redemption price, percentage			100.00%
Convertible Senior Notes [Member] | August 1, 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument redemption price, percentage			100.00%
Convertible Senior Notes [Member] | August 1, 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument redemption price, percentage			100.00%
Collateral Financial Arrangement [Member] | Skye Lane Properties LLC [Member]
Debt Instrument [Line Items]
Interest rate	4.95%
Frequency of periodic principal and interest payments	monthly
Aggregate principal amount	$ 12,700,000
Interest payments term	The loan is payable monthly of principal and interest based upon a 25-year amortization.
Notes maturity date	Oct. 30, 2027
Term loan amortization period	25 years
Maturity date	Oct. 30, 2027
Interest expense, net			$ 54,000
Aggregate principal amount			$ 43,000
Collateral Financial Arrangement [Member] | Skye Lane Properties LLC [Member] | 5-year Treasury Security [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	3.10%

Long-Term Debt - Valuation of E

Long-Term Debt - Valuation of Embedded Derivatives within Convertible Note (Detail) - Convertible Senior Notes [Member] - $ / shares	Dec. 01, 2017	Sep. 30, 2017	Aug. 10, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Dividend yield	1.33%	1.82%	2.13%
Yield	8.50%	8.50%	10.20%
Risk-free rate	2.58%	2.63%	2.55%
Volatility	20.00%	20.50%	25.80%
Remaining Term (years)	4 years 8 months 1 day	4 years 10 months 3 days	4 years 11 months 23 days
Stock price	$ 18	$ 13.21	$ 11.26

Long-Term Debt - Summary of Der

Long-Term Debt - Summary of Derivative Liability Activity (Detail) - Convertible Senior Notes [Member] - Level 3 [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value at issuance	$ 16,838
Change fair value	41,013
Conversion option related to extinguishment of notes	6,211
Carrying value at December 31, 2017	$ 51,641

Long-Term Debt - Schedule of Co

Long-Term Debt - Schedule of Company's Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Principal amount	$ 207,782	$ 79,500
Total long-term debt	184,405	72,905
Convertible Debt [Member]
Debt Instrument [Line Items]
Principal amount	115,624
Debt discount and issuance cost on convertible debt	17,605
Senior Note Payable [Member]
Debt Instrument [Line Items]
Principal amount	79,500	79,500
Debt issuance cost on senior note payable	5,772	$ 6,595
Mortgage Loan [Member]
Debt Instrument [Line Items]
Principal amount	$ 12,658

Long-Term Debt - Schedule of Ex

Long-Term Debt - Schedule of Expected Annual Principal Payments Due under Long-Term Debt Agreements (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Senior Notes, Principal	$ 207,782	$ 79,500
Long-term Debt Agreements [Member]
Debt Instrument [Line Items]
2,018	2,210
2,019	7,742
2,020	7,036
2,021	6,403
2,022	5,831
Thereafter	178,560
Senior Notes, Principal	$ 207,782

Income Taxes - Summary of Provi

Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal:
Current	$ (24,380)	$ 16,575	$ 48,524
Deferred	18,383	2,735	970
Provision for Federal income tax (benefit) expense	(5,997)	19,310	49,494
State:
Current	(20)	2,893	8,238
Deferred	1,244	335	46
Provision for State income tax expense	1,224	3,228	8,284
(Benefit) provision for income taxes	$ (4,773)	$ 22,538	$ 57,778

Income Taxes - Summary of U.S.

Income Taxes - Summary of U.S. Federal Income Tax Rate to Pretax Income (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Expected income tax expense at federal rate	35.00%	35.00%	35.00%
State tax expense	(22.80%)	3.70%	3.60%
Permanent items	(2.30%)	0.20%	(0.10%)
Non-deductible conversion option liability	(255.00%)
Non-deductible stock compensation	(26.00%)	0.10%
Tax exempt interest	27.00%	(2.10%)	(0.60%)
Non-deductible acquisition costs	(15.20%)	0.20%	0.10%
Executive compensation 162(m)	(11.50%)	1.10%
Political contributions	(7.80%)	0.70%	0.10%
Tax rate change	362.30%
Other	(2.70%)	1.10%	0.40%
Reported income tax expense	81.00%	40.00%	38.50%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	Dec. 22, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax [Line Items]
U.S. federal corporate tax rate			35.00%	35.00%	35.00%
Measurement period, description			The measurement period, as defined in SAB 118 for the Tax Act, begins on the enactment date of the Tax Act and ends when a company has obtained, prepared and analyzed the information that was needed in order to complete the accounting requirements under current accounting guidance. However, under no circumstances will the measurement period extend beyond one year from the enactment date of the Tax Act.
Tax benefit to operations for reduction in deferred tax liability	$ 21,300,000
Capital loss carryforward			$ 300,000
Capital loss carryforward expiration year			2,018
Goodwill from asset purchases deductible for tax purposes			$ 6,500,000	$ 7,000,000
Non-deductable goodwill			144,400,000	$ 38,400,000
Uncertain tax positions			0
Federal [Member]
Income Tax [Line Items]
Net operating loss carryforwards			13,100,000
State [Member]
Income Tax [Line Items]
Net operating loss carryforwards			$ 76,200,000
Earliest Tax Year [Member]
Income Tax [Line Items]
Operating loss carryforward expiration year			2,026
Latest Tax Year [Member]
Income Tax [Line Items]
Operating loss carryforward expiration year			2,037
Scenario Forecast [Member]
Income Tax [Line Items]
U.S. federal corporate tax rate		21.00%

Income Taxes - Components of De

Income Taxes - Components of Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Unearned premiums	$ 12,488	$ 17,209
Unearned commission	11,987
Net operating loss	4,727
Tax-related discount on loss reserve	1,250	1,829
Unrealized loss		3,113
Stock-based compensation		1,604
Prepaid expenses	1,950	1,482
Other	331	312
Total deferred tax asset	32,733	25,549
Deferred tax liabilities:
Deferred acquisition costs	9,775	16,377
Prepaid expenses	27,568
Unrealized gain	30
Property and equipment		355
Note discount	3,818
Basis in purchased investments	335	1,697
Basis in purchased intangibles	24,250	9,791
Other	1,290	332
Total deferred tax liabilities	67,066	28,552
Net deferred tax liability	$ (34,333)	$ (3,003)

Statutory Accounting and Regu87

Statutory Accounting and Regulations - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Apr. 23, 2013
Statutory Accounting Practices [Line Items]
Statutory net income of insurance subsidiary	$ 50,600,000	$ 567,000
Deposits held	$ 250,000
Statutory capital and surplus			$ 1,000,000
Reinsurance Policy, Description	Statutory accounting requires a provision for reinsurance liability be established for reinsurance recoverable on paid losses aged over ninety days and for unsecured amounts recoverable from unauthorized reinsurers.
Date of incorporation/ Acquisition	Apr. 23, 2013
No Action Level [Member] | Minimum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	200.00%
Company Action Level [Member] | Minimum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	150.00%
Company Action Level [Member] | Maximum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	200.00%
Regulatory Action Level [Member] | Minimum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	100.00%
Regulatory Action Level [Member] | Maximum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	150.00%
Authorized Control Level [Member] | Minimum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	70.00%
Authorized Control Level [Member] | Maximum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	100.00%
Mandatory Control Level [Member] | Minimum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	70.00%
Heritage P&C [Member]
Statutory Accounting Practices [Line Items]
Statutory accounting practices, capital and surplus requirements of insurance subsidiary	Greater of $15 million or 10% of their respective liabilities.
Minimum required amount of capital and surplus maintained by the insurance subsidiary	$ 15,000,000
Statutory capital and surplus requirements, percentage	10.00%
Heritage P&C [Member] | Minimum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	300.00%
Zephyr [Member]
Statutory Accounting Practices [Line Items]
Deposits held	$ 750,000
Zephyr [Member] | Minimum [Member]
Statutory Accounting Practices [Line Items]
Risk-based capital	300.00%
NBIC [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 3,000,000
Heritage P&C, Zephyr, and NBIC [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus	$ 376,300,000
Heritage P&C and Zephyr [Member]
Statutory Accounting Practices [Line Items]
Statutory capital and surplus		$ 276,100,000

Statutory Accounting and Regu88

Statutory Accounting and Regulations - Consolidated GAAP Net (Loss) Income to Statutory Net Income of Insurance Subsidiaries (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statutory Accounting Practices [Line Items]
Consolidated GAAP net (loss) income	$ (5,048)	$ (8,696)	$ 6,642	$ 5,983	$ (2,856)	$ 10,930	$ 18,368	$ 7,423	$ (1,119)	$ 33,865	$ 92,512
Deferred acquisition costs									(1,101)	7,979	10,430
Allowance for doubtful accounts											(250)
Net Income Reconciliation [Member]
Statutory Accounting Practices [Line Items]
Consolidated GAAP net (loss) income									(1,119)	33,865	92,512
Deferred income taxes									32,644	6,069	1,755
Deferred acquisition costs									1,101	(7,979)	(10,430)
Surplus note interest									(4)		(347)
Non-statutory subsidiaries									5,410	(32,874)	(36,569)
Investment basis difference									446	540
Pre-acquisition income									20,839	3,755
Equity compensation									(2,408)	(2,107)	(1,074)
Convertible notes									1,051
Commission revenue									(6,700)
Allowance for doubtful accounts											(250)
Other									(709)	(702)
Statutory net income of insurance subsidiaries									$ 50,551	$ 567	$ 45,597

Accounts Payable and Other Li89

Accounts Payable and Other Liabilities - Schedule of Other Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Deferred ceding commission	$ 51,109
Outstanding claim checks	79,666
Accounts payable and other payables	17,948	$ 6,804
Accrued interest and issuance costs	3,117	5,704
Accrued dividends		1,784
Escrow	1,210	1,210
Premium tax	3,660
Other liabilities	218
Commission payables	12,609	6,179
Total other liabilities	$ 169,537	$ 21,681

Accrued Bonus Compensation - Ad

Accrued Bonus Compensation - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Compensation Related Costs [Abstract]
Accrued employee's bonus compensation	$ 6.9	$ 4.4	$ 14.1
Accrued employee's bonus compensation paid in cash	$ 0.9	$ 0.8	$ 12.1

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2017	Dec. 31, 2017
Mrs. Shannon Lucas [Member]
Related Party Transaction [Line Items]
Consulting fees hourly rate	$ 400
Immediate Family Member of Management or Principal Owner [Member]
Related Party Transaction [Line Items]
Consulting fees		$ 440,000
Heritage P&C [Member] | Director [Member]
Related Party Transaction [Line Items]
Director annual compensation	$ 75,000

Employee Benefit Plan - Additio

Employee Benefit Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
NBIC [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Plan Name	401(k)
Employer contribution, vesting percentage	20.00%
Employer contribution, vesting period	5 years
Maximum [Member] | NBIC [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of contribution on employee salary	3.00%
Heritage P&C [Member]
Defined Contribution Plan Disclosure [Line Items]
Percentage of contribution on employee salary	3.00%
Contribution for participating employees	$ 815,000	$ 685,000
Defined Contribution Plan, Plan Name	401(k)
Medical premium cost	$ 3,000,000	$ 2,400,000
Unpaid claims	249,000
Stop loss coverage per employee	60,000
Defined contribution plan, aggregate limit for losses	$ 1,500,000
Defined contribution plan, aggregate stop loss commences threshold percentage	125.00%
Heritage P&C [Member] | Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, aggregate limit for losses in provided amount	$ 1,000,000

Equity - Additional Information

Equity - Additional Information (Detail) - USD ($)	Sep. 14, 2015	Oct. 31, 2017	Aug. 08, 2017	May 02, 2017	Mar. 02, 2017	Dec. 31, 2017	Dec. 31, 2016	May 04, 2016	Dec. 31, 2015
Class Of Stock [Line Items]
Common stock, shares authorized						50,000,000	50,000,000
Preferred stock, shares authorized						5,000,000
Common stock, shares outstanding						25,885,004	28,840,443
Treasury stock, shares						7,099,597	1,759,330
Additional paid-in capital						$ 294,836,000	$ 205,727,000
Common stock voting rights						one vote
Stock Repurchase Program, Authorized Amount	$ 20,000,000							$ 50,000,000
Stock Repurchase Program Expiration Date	Dec. 31, 2017
Treasury shares repurchased, shares							1,759,330
Treasury shares repurchased, value						$ 61,623,000	$ 25,562,000
Cash dividend		$ 1,458,787	$ 1,478,333	$ 1,743,385	$ 1,784,426	$ 6,500,000
Convertible Senior Notes [Member]
Class Of Stock [Line Items]
Treasury shares repurchased, shares						3,552,397
Treasury shares repurchased, price per share						$ 11.26
Open Market Transactions [Member]
Class Of Stock [Line Items]
Treasury shares repurchased, shares						1,787,870
Treasury shares repurchased, value						$ 21,600,000
Restricted Stock [Member]
Class Of Stock [Line Items]
Unvested restricted common stock issued						675,000	900,000		1,125,000

Equity - Summary of Cash Divide

Equity - Summary of Cash Dividends (Detail) - USD ($)	3 Months Ended				12 Months Ended
	Oct. 31, 2017	Aug. 08, 2017	May 02, 2017	Mar. 02, 2017	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Cash dividend per common share	$ 0.06	$ 0.06	$ 0.06	$ 0.06	$ 0.30	$ 0.23
Total cash dividends paid	$ 1,458,787	$ 1,478,333	$ 1,743,385	$ 1,784,426	$ 6,500,000
Record date	Nov. 17, 2017	Sep. 15, 2017	Jun. 15, 2017	Mar. 15, 2017
Payment date	Dec. 15, 2017	Oct. 2, 2017	Jul. 5, 2017	Apr. 4, 2017

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)	Apr. 30, 2015	Dec. 02, 2014	Sep. 24, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 22, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum tenure of stock option from the date of grant				10 years
Exercisable period of vested awards				30 days
Shares granted to employees and directors		1,326,923	359,000		0	0
Stock options expiration date			Sep. 24, 2017
Fair value of option granted			$ 2.70
Fair value of options vested						$ 2,700,000	$ 2,500,000
Employee Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options expiration date		Dec. 2, 2017
Stock-based compensation expense				$ 0	$ 0	1,900,000
Director Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options expiration date		Dec. 2, 2017
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, Vesting period				5 years
Stock-based compensation expense				$ 4,800,000	$ 3,800,000	$ 749,000
Restricted stock awards granted				0		1,125,000
Unrecognized stock compensation expense				$ 13,700,000
Unrecognized stock compensation expense, weighted average period				1 year 10 months 24 days
Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of vesting of awards granted		50.00%
Share-based Compensation Award, Tranche Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of vesting of awards granted	50.00%
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, Vesting period				1 year
Fair value of option granted							$ 3.07
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options, Vesting period				5 years
Fair value of option granted							$ 3.54
Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for issuance								2,981,737
Shares available for grant				1,125,243	170,814

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Option Activity(Detail) - $ / shares	Dec. 02, 2014	Sep. 24, 2014	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning Balance, Shares			1,149,923	1,149,923	1,685,923
Granted, Shares	1,326,923	359,000		0	0
Exercised, Shares			(24,680)		(536,000)
Expired, Shares			(1,125,243)
Ending Balance, Shares				1,149,923	1,149,923
Weighted-Average Grant Date Fair Value, Beginning Balance			$ 2.99	$ 2.99	$ 2.79
Weighted-Average Grant Date Fair Value, Exercised			3.07		4.29
Weighted-Average Grant Date Fair Value, Expired			$ 2.99
Weighted-Average Grant Date Fair Value, Ending Balance				$ 2.99	$ 2.99

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Restricted Stock Activity (Detail) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Beginning balance, Number of shares	900,000	1,125,000
Granted, Number of shares	0		1,125,000
Vested, Number of shares	(137,935)	(158,365)
Canceled and surrendered, Number of shares	(87,065)	(66,635)
Ending balance, Number of shares	675,000	900,000	1,125,000
Beginning balance, Weighted-Average Grant-Date Fair Value per Share	$ 18.42	$ 21.40
Granted, Weighted-Average Grant-Date Fair Value per Share			$ 21.40
Vested, Weighted-Average Grant-Date Fair Value per Share	16.53	14.67
Canceled and surrendered, Weighted-Average Grant-Date Fair Value per Share	17.41	14.67
Ending balance, Weighted-Average Grant-Date Fair Value per Share	$ 21.40	$ 18.42	$ 21.40

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Deferred Tax Benefits Recognized and Tax Benefits Realized to Restricted Stock Awards (Detail) - Restricted Stock [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Deferred tax benefit recognized			$ 76
Tax benefit realized for restricted stock and paid dividends			$ 357
Fair value of vested restricted stock	$ 3,796	$ 3,301

Condensed Financial Informati99

Condensed Financial Information of Heritage Insurance Holdings, Inc. - Schedule of Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Fixed maturity securities, available for sale, at fair value	$ 549,796	$ 571,011
Cash and cash equivalents	153,697	105,817	$ 236,277	$ 160,481
Other assets	19,883	5,775
Total Assets	1,771,210	1,033,244
LIABILITIES AND STOCKHOLDERS' EQUITY
Other liabilities	169,537	21,681
Total Liabilities	1,391,394	675,285
Total Stockholders' Equity	379,816	357,959	356,553	255,089
Total Liabilities and Stockholders' Equity	1,771,210	1,033,244
Parent Company [Member]
ASSETS
Fixed maturity securities, available for sale, at fair value		77,922
Cash and cash equivalents	16,249	7,368	$ 36,762	$ 30,927
Investment in and advances to subsidiaries	584,983	334,983
Other assets	1,294	19,055
Total Assets	602,526	439,328
LIABILITIES AND STOCKHOLDERS' EQUITY
Other liabilities	222,710	81,369
Total Liabilities	222,710	81,369
Total Stockholders' Equity	379,816	357,959
Total Liabilities and Stockholders' Equity	$ 602,526	$ 439,328

Condensed Financial Informat100

Condensed Financial Information of Heritage Insurance Holdings, Inc. - Schedule of Condensed Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Other revenue									$ 15,163	$ 16,323	$ 9,595
Total revenue	$ 108,618	$ 101,774	$ 96,938	$ 99,293	$ 102,806	$ 109,306	$ 115,281	$ 111,565	406,623	438,958	394,792
Expenses:
General and administrative expense									71,714	58,910	46,125
Interest expense, net									13,210	362
Other non-operating expense, net									42,217
Total expenses	85,448	100,361	83,876	87,403	106,450	90,694	85,524	99,525
Benefit from income taxes									(4,773)	22,538	57,778
Net (loss) income	$ (5,048)	$ (8,696)	$ 6,642	$ 5,983	$ (2,856)	$ 10,930	$ 18,368	$ 7,423	(1,119)	33,865	92,512
Parent Company [Member]
Revenue:
Other revenue									1,949	1,403	1,129
Total revenue									1,949	1,403	1,129
Expenses:
General and administrative expense									17,792	11,558	9,036
Amortization of debt issuance cost									2,314	41
Interest expense, net									11,158	321
Other non-operating expense, net									41,013
Total expenses									72,277	11,920	9,036
Loss before income taxes and equity in net income of subsidiaries									(70,328)	(10,517)	(7,907)
Benefit from income taxes									(6,120)	(2,035)	(2,227)
Loss before equity in net income of subsidiaries									(64,208)	(8,482)	(5,680)
Equity in net income of subsidiaries											98,192
Net (loss) income									$ (64,208)	$ (8,482)	$ 92,512

Condensed Financial Informat101

Condensed Financial Information of Heritage Insurance Holdings, Inc. - Schedule of Condensed Statements of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Condensed Cash Flow Statements Captions [Line Items]
Net cash provided by (used in) operating activities	$ 7,566	$ 67,122	$ 146,881
Investing Activities
Purchases of investments available for sale	(215,844)	(317,666)	(237,946)
Net cash used in investing activities	(7,242)	(249,416)	(86,964)
Financing Activities
Proceeds from mortgage loan	12,658
Excess tax (expense) benefit on stock-based compensation		(739)	739
Shares tendered for income tax withholding	(1,599)	(977)
Purchase of treasury stock	(61,623)	(25,562)
Dividends	(8,249)	(6,806)
Increase (decrease) in cash and cash equivalents	47,880	(130,460)	75,796
Cash and cash equivalents, beginning of period	105,817	236,277	160,481
Cash and cash equivalents, end of period	153,697	105,817	236,277
Parent Company [Member]
Condensed Cash Flow Statements Captions [Line Items]
Net cash provided by (used in) operating activities	27,154	(6,045)	7,196
Investing Activities
Purchases of investments available for sale	78,213	(77,910)
Dividends received from subsidiaries	57,575	85,096	21,400
Acquisition of a business	(210,000)
Investments and advances to subsidiaries		(74,361)	(32,400)
Net cash used in investing activities	(47,058)	(73,220)	(3,804)
Financing Activities
Proceeds from exercise of stock options and warrants	417		8,900
Proceeds from issuance of note payable, net of issuance costs	114,335	77,910
Proceeds from mortgage loan	12,658
Excess tax (expense) benefit on stock-based compensation		(739)	739
Shares tendered for income tax withholding	(1,599)	(977)
Purchase of treasury stock	(61,623)	(25,562)
Dividends	(8,249)	(6,806)
Net cash provided by financing activities	55,939	43,826	9,639
Increase (decrease) in cash and cash equivalents	8,881	(29,394)	5,835
Cash and cash equivalents, beginning of period	7,368	36,762	30,927
Cash and cash equivalents, end of period	$ 16,249	$ 7,368	$ 36,762

Quarterly Results of Operati102

Quarterly Results of Operations (Unaudited) - Summary of Unaudited Quarterly Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net premiums earned	$ 101,728	$ 95,208	$ 90,452	$ 92,176	$ 94,906	$ 101,555	$ 108,918	$ 106,342	$ 379,564	$ 411,721	$ 376,268
Investment income	3,122	2,735	2,973	2,502	2,595	2,326	2,223	2,037
Total revenues	108,618	101,774	96,938	99,293	102,806	109,306	115,281	111,565	406,623	438,958	394,792
Total operating expenses	85,448	100,361	83,876	87,403	106,450	90,694	85,524	99,525
Operating income	23,170	1,413	13,062	11,890	(3,644)	18,612	29,757	12,040	49,535	56,765	150,290
Net (loss) income	$ (5,048)	$ (8,696)	$ 6,642	$ 5,983	$ (2,856)	$ 10,930	$ 18,368	$ 7,423	$ (1,119)	$ 33,865	$ 92,512
Basic (loss) earnings per share:	$ (0.18)	$ (0.34)	$ 0.23	$ 0.21	$ (0.09)	$ 0.37	$ 0.62	$ 0.24	$ (0.04)	$ 1.14	$ 3.08
Diluted (loss) earnings per share:	$ (0.18)	$ (0.34)	$ 0.23	$ 0.21	$ (0.09)	$ 0.37	$ 0.62	$ 0.24	$ (0.04)	$ 1.14	$ 3.05
Operating income	$ 23,170	$ 1,413	$ 13,062	$ 11,890	$ (3,644)	$ 18,612	$ 29,757	$ 12,040	$ 49,535	$ 56,765	$ 150,290

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) $ in Thousands	Feb. 02, 2018USD ($)Officershares	Dec. 31, 2017USD ($)shares	Dec. 31, 2016USD ($)	Dec. 31, 2015shares
Restricted Stock [Member]
Subsequent Event [Line Items]
Restricted stock awards granted		0		1,125,000
Stock options, Vesting period		5 years
Fair value of vested restricted stock | $		$ 3,796	$ 3,301
Subsequent Event
Subsequent Event [Line Items]
Number of executive officer | Officer	2
Subsequent Event | Restricted Stock [Member]
Subsequent Event [Line Items]
Restricted stock awards granted	125,000
Stock options, Vesting period	5 years
Vesting in equal annual installement	25,000
Fair value of vested restricted stock | $	$ 1,300