Basis of Presentation	6 Months Ended
Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	1. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management of Iconix Brand Group, Inc. (the “Company,” “we,” “us,” or “our”), all adjustments (consisting primarily of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended June 30, 2019 (“Current Quarter”) and the six months ended June 30, 2019 (“Current Six Months”) are not necessarily indicative of the results that may be expected for a full fiscal year. The interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. During the Current Six Months, the Company adopted one new accounting pronouncement. Refer to Note 20 for further details. Correction of an Immaterial Error During the Current Six Months, the Company determined that the impact of the accretion of redeemable noncontrolling interest to the Company’s earnings per share calculation had been incorrectly recorded in the Company’s condensed consolidated statement of operations for the Prior Year Quarter, the Prior Year Six Months, the quarter ended September 30, 2018 and the nine months ended September 30, 2018. Basic and diluted earnings per share for the Prior Year Quarter and Prior Year Six Months have been corrected in this Form 10-Q. Management evaluated the materiality of this error from a quantitative and qualitative perspective and concluded that the adjustments to earnings per share were not material to the Company’s presentation and disclosures, and has no material impact on the Company’s financial position, results of operations and cash flows. Accordingly, no amendments to previously filed reports are deemed necessary. After taking into effect this adjustment, for the quarter ended September 30, 2018 and the nine months ended September 30, 2018, basic earnings per share would have been income of $2.81 and a loss of $4.87, respectively, and diluted earnings per share would have been income of $0.26 and a loss of $7.35, respectively. Certain reclassifications, which were immaterial, have been made to conform prior year data to the current presentation. During the Current Six Months, the Company also made a reclassification between redeemable noncontrolling interest and noncontrolling interest. Liquidity These consolidated financial statements are prepared on a going concern basis that contemplates the realization of cash flows from assets and discharge of liabilities, in each case, in the ordinary course of business consistent with the Company’s prior periods. The Company considered, among other things, the Sears Holdings Corporation’s bankruptcy filing on October 15, 2018, and determined that the bankruptcy filing is not expected to have a material adverse impact on the Company’s ability to continue as a going concern. Based on the Company’s financial plans and projections for 2019, which assumes the realization of significant cost savings, among other things, from the successful implementation of the Company’s current strategic initiatives, the Company does not expect the occurrence of any payment defaults on its outstanding debt facilities in the next twelve months, and otherwise expects to generate sufficient cash to meet its operating cash flow needs and maintain compliance with the financial covenants set forth in its various debt facilities during such period. In particular, management believes the allocation of residual royalty collections to a restricted reserve account (as is discussed in Note 9) is not expected to have a material adverse impact on the Company’s ability to meet such cash flow needs. For additional information, please refer to Note 1 of Notes to Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. Reverse Stock Split On March 14, 2019, the Company effected a 1-for-10 reverse stock split (the “Reverse Stock Split”) of its common stock. Unless the context otherwise requires, all share and per share amounts in this quarterly report on Form 10-Q have been adjusted to reflect the Reverse Stock Split. Refer to Note 9 for further details.

Basis of Presentation

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management of Iconix Brand Group, Inc. (the “Company,” “we,” “us,” or “our”), all adjustments (consisting primarily of normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended June 30, 2019 (“Current Quarter”) and the six months ended June 30, 2019 (“Current Six Months”) are not necessarily indicative of the results that may be expected for a full fiscal year. The interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

During the Current Six Months, the Company adopted one new accounting pronouncement. Refer to Note 20 for further details.

Correction of an Immaterial Error

During the Current Six Months, the Company determined that the impact of the accretion of redeemable noncontrolling interest to the Company’s earnings per share calculation had been incorrectly recorded in the Company’s condensed consolidated statement of operations for the Prior Year Quarter, the Prior Year Six Months, the quarter ended September 30, 2018 and the nine months ended September 30, 2018. Basic and diluted earnings per share for the Prior Year Quarter and Prior Year Six Months have been corrected in this Form 10-Q. Management evaluated the materiality of this error from a quantitative and qualitative perspective and concluded that the adjustments to earnings per share were not material to the Company’s presentation and disclosures, and has no material impact on the Company’s financial position, results of operations and cash flows. Accordingly, no amendments to previously filed reports are deemed necessary. After taking into effect this adjustment, for the quarter ended September 30, 2018 and the nine months ended September 30, 2018, basic earnings per share would have been income of $2.81 and a loss of $4.87, respectively, and diluted earnings per share would have been income of $0.26 and a loss of $7.35, respectively.

Certain reclassifications, which were immaterial, have been made to conform prior year data to the current presentation. During the Current Six Months, the Company also made a reclassification between redeemable noncontrolling interest and noncontrolling interest.

Liquidity

These consolidated financial statements are prepared on a going concern basis that contemplates the realization of cash flows from assets and discharge of liabilities, in each case, in the ordinary course of business consistent with the Company’s prior periods. The Company considered, among other things, the Sears Holdings Corporation’s bankruptcy filing on October 15, 2018, and determined that the bankruptcy filing is not expected to have a material adverse impact on the Company’s ability to continue as a going concern. Based on the Company’s financial plans and projections for 2019, which assumes the realization of significant cost savings, among other things, from the successful implementation of the Company’s current strategic initiatives, the Company does not expect the occurrence of any payment defaults on its outstanding debt facilities in the next twelve months, and otherwise expects to generate sufficient cash to meet its operating cash flow needs and maintain compliance with the financial covenants set forth in its various debt facilities during such period. In particular, management believes the allocation of residual royalty collections to a restricted reserve account (as is discussed in Note 9) is not expected to have a material adverse impact on the Company’s ability to meet such cash flow needs.

For additional information, please refer to Note 1 of Notes to Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

Reverse Stock Split

On March 14, 2019, the Company effected a 1-for-10 reverse stock split (the “Reverse Stock Split”) of its common stock. Unless the context otherwise requires, all share and per share amounts in this quarterly report on Form 10-Q have been adjusted to reflect the Reverse Stock Split. Refer to Note 9 for further details.