Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2014
Accounting Policies [Abstract]
Basis of Presentation	*Basis of Presentation* The accompanying unaudited, consolidated financial statements for HCI Group, Inc. and its subsidiaries (collectively, the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information, and the Securities and Exchange Commission (“SEC”) rules for interim financial reporting. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been omitted pursuant to such rules and regulations. However, in the opinion of management, the accompanying financial statements reflect all normal recurring adjustments necessary to present fairly the Company’s financial position as of September 30, 2014 and the results of operations and cash flows for the periods presented. The results of operations for the interim periods presented are not necessarily indicative of the results of operations to be expected for any subsequent interim period or for the fiscal year ending December 31, 2014. The accompanying unaudited consolidated financial statements and notes thereto should be read in conjunction with the audited consolidated financial statements for the year ended December 31, 2013 included in the Company’s Form 10-K, which was filed with the SEC on March 12, 2014. In preparing the interim unaudited consolidated financial statements, management was required to make certain judgments, assumptions, and estimates that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures at the financial reporting date and throughout the periods being reported upon. Certain of the estimates result from judgments that can be subjective and complex and consequently actual results may differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term are related to the Company’s losses and loss adjustment expenses, which include amounts estimated for claims incurred but not yet reported. The Company uses various assumptions and actuarial data it believes to be reasonable under the circumstances to make these estimates. In addition, accounting policies specific to reinsurance with retrospective provisions, deferred income taxes, and stock-based compensation expense involve significant judgments and estimates material to the Company’s consolidated financial statements. All significant intercompany balances and transactions have been eliminated.
Acquisition, Development and Construction Loan Arrangement	*Acquisition, Development and Construction Loan Arrangement* The Company has an acquisition, development and construction loan arrangement (“ADC Arrangement”) under which it provides financing to a property developer for the acquisition, development, and construction of a retail shopping center. The Company also expects to participate in the residual profit resulting from the ultimate sale or other use of the property. Classification and accounting for the ADC Arrangement as a loan, an investment in real estate, or a joint venture is determined by the Company’s evaluation of the characteristics and the risks and rewards of the ADC Arrangement. If the Company expects to receive more than 50% of the residual profit from the ADC Arrangement and it has characteristics similar to a real estate investment, the costs of the real estate project will be capitalized and interest will be recognized in net investment income (see Note 3 — “Investments”). In addition, the Company considers any rights or features embedded in the ADC Arrangement that may require bifurcation and derivative accounting. Due to its participation in the expected residual profit, which is deemed a variable interest, the Company evaluates its involvements in the design and essential activities of the entity to which the Company provides financing for possible consolidation as the primary beneficiary under the Variable Interest Model prescribed by the Financial Accounting Standards Board (“FASB”). Any subsequent changes in terms, rights or the developer’s equity interest that may result in a reclassification or a change in the accounting treatment of the ADC Arrangement will be evaluated. The Company will continually assess the collectability of principal, accrued interest and fees.
Investment in Joint Venture	*Investment in Joint Venture* The Company has a 90% equity interest in a joint venture that was organized to acquire and develop land on which the joint venture partners plan to construct a retail shopping center (see Note 3 — “Investments”) for lease or for sale. The joint venture was determined to be a variable interest entity as it lacks sufficient equity to finance its activities without additional subordinated financial support. Despite having a majority equity interest, the Company does not have a controlling financial interest and, accordingly, is not required to consolidate the joint venture as its primary beneficiary under the Variable Interest Model. In addition, the joint venture agreement contains an embedded purchase option the Company can exercise to purchase the entire interest of the other party to the joint venture after the expiration of a restricted period. The Company determined the embedded purchase option is not required to be bifurcated and fair value accounting at each reporting date is not applicable. Due to the lack of a controlling financial interest and until the embedded purchase option becomes exercisable, the Company uses the equity method rather than consolidation to account for its investment in the joint venture.

Disclosure of accounting policy for the equity method of accounting for investments in common stock or other interests including unconsolidated subsidiaries, corporate joint ventures, noncontrolling interests in real estate ventures, limited partnerships, and limited liability companies. The accounting policy may include information such as: (1) initially recording an investment in the stock of an investee at cost; (2) adjusting the carrying amount of the investment to recognize the investor's share of the earnings or losses of the investee after the date of acquisition; and (3) adjustments to reflect the investor's share of changes in the investee's capital (dividends). This disclosure may also include a detailed description of the policy for determining the amount of equity method losses recognized after an investment has been reduced to zero as a result of previous losses, reasons for not using the equity method when the investor company owns 20 percent or more of the voting stock of the investee's company (including identification of the significant investee), reasons for using the equity method when the ownership percentage is less than 20 percent, and discussion of recognition of equity method losses when an investor's total investment in an investee includes, in addition to an investment in common stock, other investments such as preferred stock and loans to the investee. An entity also may describe how such investments are assessed for impairment.

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