Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 1 — Summary of Significant Accounting Policies *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 consolidated 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 consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the Company’s financial position as of September 30, 2016 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, 2016. 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, 2015 included in the Company’s Form 10-K, which was filed with the SEC on March 4, 2016. 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 for reinsurance contracts with retrospective provisions, deferred income taxes, stock-based compensation expense, fair value of financial instruments and other-than-temporary impairment involve significant judgments and estimates material to the Company’s consolidated financial statements. All significant intercompany balances and transactions have been eliminated. *Business Acquisitions.* The Company accounts for business acquisitions using the acquisition method, which requires it to measure and recognize the assets acquired, liabilities assumed, and any noncontrolling interest in the acquiree at their acquisition date fair values. In the event that the fair value of net assets acquired exceeds the purchase price, a bargain purchase gain is recorded. Acquisitions of income-producing properties are typically considered business acquisitions. As such, the Company allocates the purchase price to land, land improvements, buildings, tenant improvements, intangibles such as the value of significant tenant (i.e. anchor tenant) relationships, in-place leases, and assumed liabilities, if any. Tangible assets are presented as real estate investments on the Company’s consolidated balance sheet. Buildings subject to leases are valued as if vacant. The value attributable to in-place leases reflects the costs we would have incurred to lease the property to the occupancy level that existed at the acquisition date. These costs include leasing commissions, tenant improvement allowances, and other direct costs required to lease the property. In addition, the estimated fair value of in-place leases reflects the value of base rental revenues that would have been earned during the assumed periods of vacancy and the related carrying costs that would have been incurred to lease the vacant property to its existing occupancy. The Company also reviews terms of the assumed leases to evaluate whether the terms are favorable or unfavorable relative to the market at the acquisition date. In the event the assumed leases are not at market terms, the Company recognizes an intangible asset for a lease with favorable terms and a liability if the terms of the lease are unfavorable. Transaction costs related to a business acquisition are expensed as incurred. The Company includes acquisition-related costs associated with real estate investments in other operating expenses in the consolidated statement of income. *Intangible Assets.* Intangibles consist of the value attributable to the acquired in-place leases and the primary, or anchor, tenant relationships. The value attributable to the anchor tenant relationship represents the economic benefits of having a nationally recognized retailer as the lead tenant, which draws traffic and other tenants to the retail center. These intangibles are amortized to expense over the related lease term. Amortization of the intangibles related to real estate investments is reflected in net investment income in the consolidated statement of income. The Company reviews these intangible assets for impairment when events or changes in circumstances indicate the carrying value may not be recoverable. *Reclassifications.* Certain reclassifications of prior year amounts have been made to conform to the current year presentation.

Note 1 — Summary of Significant Accounting Policies

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 consolidated 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 consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the Company’s financial position as of September 30, 2016 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, 2016. 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, 2015 included in the Company’s Form 10-K, which was filed with the SEC on March 4, 2016.

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 for reinsurance contracts with retrospective provisions, deferred income taxes, stock-based compensation expense, fair value of financial instruments and other-than-temporary impairment involve significant judgments and estimates material to the Company’s consolidated financial statements.

All significant intercompany balances and transactions have been eliminated.

Business Acquisitions. The Company accounts for business acquisitions using the acquisition method, which requires it to measure and recognize the assets acquired, liabilities assumed, and any noncontrolling interest in the acquiree at their acquisition date fair values. In the event that the fair value of net assets acquired exceeds the purchase price, a bargain purchase gain is recorded.

Acquisitions of income-producing properties are typically considered business acquisitions. As such, the Company allocates the purchase price to land, land improvements, buildings, tenant improvements, intangibles such as the value of significant tenant (i.e. anchor tenant) relationships, in-place leases, and assumed liabilities, if any. Tangible assets are presented as real estate investments on the Company’s consolidated balance sheet. Buildings subject to leases are valued as if vacant.

The value attributable to in-place leases reflects the costs we would have incurred to lease the property to the occupancy level that existed at the acquisition date. These costs include leasing commissions, tenant improvement allowances, and other direct costs required to lease the property. In addition, the estimated fair value of in-place leases reflects the value of base rental revenues that would have been earned during the assumed periods of vacancy and the related carrying costs that would have been incurred to lease the vacant property to its existing occupancy. The Company also reviews terms of the assumed leases to evaluate whether the terms are favorable or unfavorable relative to the market at the acquisition date. In the event the assumed leases are not at market terms, the Company recognizes an intangible asset for a lease with favorable terms and a liability if the terms of the lease are unfavorable.

Transaction costs related to a business acquisition are expensed as incurred. The Company includes acquisition-related costs associated with real estate investments in other operating expenses in the consolidated statement of income.

Intangible Assets. Intangibles consist of the value attributable to the acquired in-place leases and the primary, or anchor, tenant relationships. The value attributable to the anchor tenant relationship represents the economic benefits of having a nationally recognized retailer as the lead tenant, which draws traffic and other tenants to the retail center. These intangibles are amortized to expense over the related lease term. Amortization of the intangibles related to real estate investments is reflected in net investment income in the consolidated statement of income. The Company reviews these intangible assets for impairment when events or changes in circumstances indicate the carrying value may not be recoverable.

Reclassifications. Certain reclassifications of prior year amounts have been made to conform to the current year presentation.