Consolidated Entities, Joint Ventures and Investments - Additional Information (Detail) ₨ in Millions				1 Months Ended																				3 Months Ended				6 Months Ended		12 Months Ended
		Mar. 31, 2018	Apr. 26, 2011 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2018 USD ($)	Jun. 30, 2018	Apr. 30, 2018	Jul. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Feb. 28, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jan. 31, 2014 USD ($)	Oct. 31, 2013 USD ($)	Jul. 31, 2013 USD ($)	Jun. 30, 2013 USD ($)	Feb. 28, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2012 USD ($)	Mar. 31, 2010 USD ($)	May 31, 2009 USD ($) shares	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) Multiplier	Dec. 31, 2018 USD ($) Multiplier	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jan. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Nov. 30, 2013 USD ($)	Sep. 30, 2013 USD ($)	Jun. 30, 2012 INR (₨)	Dec. 31, 2009
Schedule Of Investments [Line Items]
Redeemable non-controlling interest																								$ 34,461,000				$ 34,137,000		$ 34,461,000	$ 34,137,000
Type of Revenue [Extensible List]																														us-gaap:LicenseMember	us-gaap:LicenseMember
Additional equity interest acquisition date																																	2017-02
Investment impairment																														$ 26,613,000	$ 2,500,000
Noncontrolling interest																								26,521,000				26,999,000		26,521,000	26,999,000
Revenue reorganized from accrued assets																												800,000
Selling general and administrative expenses increased																												200,000
Net income attributable to noncontrolling interest																												$ 300,000
Impairment of equity method investment																								0							0
Distributions from equity investments																														2,681,000	3,021,000
Complex Media Inc.
Schedule Of Investments [Line Items]
Cash received from escrow																																					$ 1,000,000
Gain on sale of investments																															1,000,000
Lee Cooper And Umbro Brands
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid																																		$ 3,500,000
Percentage of interest sold in equity method investment																																		70.00%
Business acquisition total purchase price																																		$ 24,700,000
Company purchased the Umbro China and Lee Cooper brands																																		24,700,000
Note receivable																																		9,400,000
Business consideration payable																								2,100,000						2,100,000
Adjustments to additional paid in capital of excess purchase price over non-controlling interest																														2,200,000
Lee Cooper And Umbro Brands | Accounts Payable And Accrued Liabilities
Schedule Of Investments [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities																																		5,200,000
Lee Cooper And Umbro Brands | Other Noncurrent Liabilities
Schedule Of Investments [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities																																		5,400,000
Hong Kong MH Umbro International Co. Limited
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid										$ 25,000,000
Business acquisition completion period										4 years
Equity ownership percentage										50.00%
LiNing
Schedule Of Investments [Line Items]
Equity Interest Acquisition Commencement Date									Jun. 30, 2020
Equity Interest Sale Cash Consideration On Commencement Date									$ 5,400,000
Alberta ULC
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid																			$ 76,500,000
Ownership interest acquired																			51.00%
Modern Amusement
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid																				$ 5,000,000
Ownership interest acquired																				51.00%
Hardy Way
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid																							$ 9,000,000
Ownership interest acquired			85.00%																				50.00%
Business acquisition total purchase price			$ 62,000,000																				$ 17,000,000
Business acquisition purchase price, common stock issued, shares | shares																							58,868
Business acquisition purchase price, common stock issued, value																							$ 8,000,000
Hardy Way | Addition capital
Schedule Of Investments [Line Items]
Business acquisition purchase price, common stock issued, value																							$ 1,000,000
Umbro China Limited | Hong Kong MH Umbro International Co. Limited
Schedule Of Investments [Line Items]
Proceeds from sale of interest										$ 2,500,000
Percentage of interest sold										5.00%
Noncontrolling interest																								1,800,000						1,800,000
Reliance Brands Limited
Schedule Of Investments [Line Items]
Additional amount agreed to be contributed as working capital																					$ 500,000																				₨ 25
MG Icon
Schedule Of Investments [Line Items]
Ownership interest acquired																						50.00%
Payments to acquire ownership interest																						$ 4,000,000
Business acquisition total purchase price																						20,000,000
Business consideration payable																						$ 3,000,000
Distributions from equity investments																											$ 23,000,000
Administrative Manager
Schedule Of Investments [Line Items]
Percentage of gross revenue paid monthly as services fee																																			5.00%
Local Manager
Schedule Of Investments [Line Items]
Percentage of gross revenue paid monthly as services fee																																			15.00%
Minimum | LiNing
Schedule Of Investments [Line Items]
Aggregate percentage of interest in newly registered company in Hong Kong									30.00%
Minimum | MG Icon
Schedule Of Investments [Line Items]
Preferred profit distribution to the Company																															$ 23,000,000
Maximum | Hong Kong MH Umbro International Co. Limited
Schedule Of Investments [Line Items]
Aggregate percentage of interest in newly registered company in Hong Kong										50.00%
Maximum | LiNing
Schedule Of Investments [Line Items]
Aggregate percentage of interest in newly registered company in Hong Kong									50.00%
Aggregate Cash Consideration Payment Increase									$ 8,600,000
Iconix Middle East
Schedule Of Investments [Line Items]
Percentage of interest sold in equity method investment												50.00%																							50.00%
Agreed price for sale of interest in a subsidiary												$ 18,800,000																							$ 18,800,000
Payment received upon sale interest in subsidiary												6,300,000
Receivable for investments sold												$ 12,500,000																							12,500,000
Committed amount receivable period												24 months
Redeemable non-controlling interest																								20,800,000						$ 20,800,000
Agreement Percentage																												120.00%			120.00%
Payment made to subsidiary for diligence and Market analysis																																			$ 3,100,000
Percentage of additional equity interest to be acquired by exercising call right																																	5.00%
Equity method investment cash Consideration																																	$ 1,800,000
Increased ownership percentage																																	55.00%
Iconix Middle East | Five-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option period																														6 months
Put/Call option commencement date																														Mar. 31, 2021
Multiplier on put and call options | Multiplier																														5.5
Iconix Middle East | Five-Year Put/Call Options | Minimum
Schedule Of Investments [Line Items]
Royalty revenue																														$ 12,000,000
Type of Revenue [Extensible List]																														us-gaap:RoyaltyMember
Iconix Middle East | Eight-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option period																														6 months
Put/Call option commencement date																														Dec. 19, 2022
Multiplier on put and call options | Multiplier																														5.5
Iconix Middle East | Eight-Year Put/Call Options | Minimum
Schedule Of Investments [Line Items]
Royalty revenue																														$ 12,000,000
Type of Revenue [Extensible List]																														us-gaap:RoyaltyMember
Iconix Israel
Schedule Of Investments [Line Items]
Percentage of interest sold in equity method investment																																							50.00%
Price for sale of interest in a subsidiary																																							$ 3,300,000
Iconix Canada
Schedule Of Investments [Line Items]
Percentage of interest sold in equity method investment																		50.00%
Agreed price for sale of interest in a subsidiary																		$ 17,800,000
Payment received upon sale interest in subsidiary																		8,900,000
Receivable for investments sold																		$ 8,900,000
Committed amount receivable period																		5 years
Iconix Europe
Schedule Of Investments [Line Items]
Ownership interest acquired															1.00%
Percentage of interest sold in equity method investment																																										50.00%
Payment received upon sale interest in subsidiary															$ 1,500,000															$ 4,000,000
Redeemable non-controlling interest																								8,700,000						$ 8,700,000
Agreement Percentage																																120.00%
Equity interest acquired															51.00%
Business Combination, Bargain Purchase, Revenue Recognized, Amount															$ 1,500,000
Preferred profit distribution to the Company															$ 3,000,000
Iconix Europe | Five-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option period																														6 months
Put/Call option commencement date																														Mar. 31, 2021
Multiplier on put and call options | Multiplier																															5.5
Iconix Europe | Eight-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option period																														6 months
Put/Call option commencement date																														Jan. 13, 2022
Multiplier on put and call options | Multiplier																														5.5
Iconix Australia
Schedule Of Investments [Line Items]
Percentage of interest sold in equity method investment																																								50.00%
Price for sale of interest in a subsidiary																																								$ 7,200,000
Gain on sale of interest in subsidiary																																				$ 4,100,000
Iconix SE Asia, Ltd.
Schedule Of Investments [Line Items]
Percentage of interest sold in equity method investment																50.00%
Agreed price for sale of interest in a subsidiary														$ 15,900,000
Payment received upon sale interest in subsidiary														$ 4,000,000		$ 7,500,000
Receivable for investments sold																$ 4,500,000
Committed amount receivable period																24 months
Agreement Percentage																120.00%
Price for sale of interest in a subsidiary																$ 12,000,000
Marketing costs incurred																																		5,400,000
Fair value of options																								20,000,000						$ 20,000,000
Pre-tax gain on deconsolidation of entity																																$ 3,800,000
Iconix SE Asia, Ltd. | Level 3
Schedule Of Investments [Line Items]
Equity-method investment at fair value																																						$ 17,400,000
Iconix SE Asia, Ltd. | Lee Cooper And Umbro Brands
Schedule Of Investments [Line Items]
Agreed price for sale of interest in a subsidiary													$ 21,500,000
Payment received upon sale interest in subsidiary													4,300,000
Guaranteed minimum distributions													$ 5,100,000
Iconix SE Asia, Ltd. | Administrative Manager
Schedule Of Investments [Line Items]
Percentage of gross revenue paid monthly as services fee																															5.00%
Iconix SE Asia, Ltd. | Local Manager
Schedule Of Investments [Line Items]
Percentage of gross revenue paid monthly as services fee																															15.00%
Iconix SE Asia, Ltd. | Minimum | Guarantee of Business Revenue
Schedule Of Investments [Line Items]
Guaranteed minimum distributions																																		$ 2,500,000
Iconix SE Asia, Ltd. | Five-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option period																6 months
Put/Call option commencement date																Mar. 31, 2021
Iconix SE Asia, Ltd. | Five-Year Put/Call Options | Europe
Schedule Of Investments [Line Items]
Multiplier on put and call options | Multiplier																															5.5
Iconix SE Asia, Ltd. | Five-Year Put/Call Options | Minimum | Europe
Schedule Of Investments [Line Items]
Agreed Value																												$ 7,600,000			$ 7,600,000
Iconix SE Asia, Ltd. | Eight-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option period																6 months
Put/Call option commencement date																Oct. 01, 2021
Iconix SE Asia, Ltd. | Eight-Year Put/Call Options | Europe
Schedule Of Investments [Line Items]
Multiplier on put and call options | Multiplier																															5.5
Iconix SE Asia, Ltd. | Eight-Year Put/Call Options | Minimum | Europe
Schedule Of Investments [Line Items]
Agreed Value																												$ 7,600,000			$ 7,600,000
Global Brands Group Asia Limited
Schedule Of Investments [Line Items]
Ownership interest acquired																																		50.00%
Iconix Lifestyle India Private Limited
Schedule Of Investments [Line Items]
Percentage of interest sold in equity method investment																					50.00%																				50.00%
Payment received upon sale interest in subsidiary																					$ 2,000,000
Receivable for investments sold																					$ 4,000,000
Committed amount receivable period																					48 months
Price for sale of interest in a subsidiary																					$ 6,000,000
Net gain recognized on sale of interest in subsidiary																																				$ 2,300,000
Iconix Lifestyle India Private Limited | Note Receivable
Schedule Of Investments [Line Items]
Receivable for investments sold																								1,000,000						1,000,000
MG Icon
Schedule Of Investments [Line Items]
Payments to acquire ownership interest																								2,600,000						2,600
Investment impairment																								$ 9,600,000						$ 9,600,000
Pony International, LLC.
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid											$ 37,000,000
Ownership interest acquired											75.00%
Percentage of minority interest in subsidiary											25.00%
Goodwill																																		$ 14,700,000
Iconix Canada
Schedule Of Investments [Line Items]
Payment received upon sale interest in subsidiary								$ 2,900,000
Percentage of purchase of ownership interest								50.00%
Purchase of ownership interest								$ 19,000,000
Percentage of net asset value								50.00%
Net asset value								$ 2,200,000
Payments to acquire ownership interest								9,000,000
Remaining payments to acquire ownership interest								$ 10,000,000
Company ownership interest								100.00%
Percentage of estimated net asset value paid								50.00%
Buffalo Brand Joint Venture
Schedule Of Investments [Line Items]
Company ownership interest								51.00%
Iconix Europe
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary															49.00%
Hydraulic IP Holdings
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid												$ 6,000,000
Ownership interest acquired												51.00%																							51.00%
Top On International Group, LLC
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary												49.00%																							49.00%
Hydraulic IP Holdings LLC | Variable Interest Entity, Primary Beneficiary
Schedule Of Investments [Line Items]
Ownership interest acquired							49.00%
Company ownership interest							51.00%
Ownership interest							100.00%
I Brands International L L C
Schedule Of Investments [Line Items]
Company ownership interest																								15.00%						15.00%
Investment impairment																															$ 2,500,000
Buffalo International Unlimited Liability Corporation
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary																			49.00%
Umbro China Limited
Schedule Of Investments [Line Items]
Company ownership interest																								100.00%						100.00%
Umbro China Limited | Hong Kong MH Umbro International Co. Limited
Schedule Of Investments [Line Items]
Ownership interest acquired				5.00%
Payments to acquire ownership interest				$ 1,300,000
Starter China Limited
Schedule Of Investments [Line Items]
Company ownership interest	[1]																							100.00%						100.00%
Starter China Limited | Photosynthesis Holdings, Co. Ltd
Schedule Of Investments [Line Items]
Business acquisition completion period		3 years
Equity Interest Acquisition Commencement Date		Jan. 16, 2022
Additional percentage of ownership interest sold		10.00%																								10.00%
Starter China Limited | Photosynthesis Holdings, Co. Ltd | Sale Agreement Over Three-Year Period from January 15, 2020
Schedule Of Investments [Line Items]
Cash consideration from sale of equity interest																										$ 20,000,000
Starter China Limited | Photosynthesis Holdings, Co. Ltd | Sale Agreement Over Three-Year Period from January 16, 2022
Schedule Of Investments [Line Items]
Cash consideration from sale of equity interest																										$ 2,700,000
Percentage of royalty received as consideration																										2.50%
Starter China Limited | Minimum | Photosynthesis Holdings, Co. Ltd
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary		50.00%																								50.00%
Starter China Limited | Maximum | Photosynthesis Holdings, Co. Ltd
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary		60.00%																								60.00%
Lee Cooper China
Schedule Of Investments [Line Items]
Company ownership interest	[2]																							100.00%						100.00%
Lee Cooper China | POS Lee Cooper HK Co. Ltd
Schedule Of Investments [Line Items]
Business acquisition completion period						2 years
Equity Interest Acquisition Commencement Date						Jan. 15, 2024
Additional percentage of ownership interest sold						10.00%																							10.00%
Lee Cooper China | POS Lee Cooper HK Co. Ltd | Sale Agreement Over Four-Year Period from October 15, 2020
Schedule Of Investments [Line Items]
Cash consideration from sale of equity interest																													$ 8,200,000
Lee Cooper China | POS Lee Cooper HK Co. Ltd | Sale Agreement Over Two-Year Period from January 15, 2024
Schedule Of Investments [Line Items]
Cash consideration from sale of equity interest																													$ 2,500,000
Percentage of royalty received as consideration																													2.50%
Lee Cooper China | Minimum | POS Lee Cooper HK Co. Ltd
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary						50.00%																							50.00%
Lee Cooper China | Maximum | POS Lee Cooper HK Co. Ltd
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary						60.00%																							60.00%
Iconix Australia
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid					$ 700,000
Ownership interest acquired					5.00%																							5.00%			5.00%
Percentage of minority interest in subsidiary					45.00%
Redeemable non-controlling interest																								$ 5,000,000						$ 5,000,000
Company ownership interest					55.00%
Ownership interest					50.00%
Business acquisition total purchase price					$ 13,013,000
Cash payment for acquisition of assets					$ 5,900,000
Iconix China
Schedule Of Investments [Line Items]
Company ownership interest																								100.00%						100.00%
Additional amount agreed to be contributed as working capital																					$ 2,000,000																				₨ 100
Marcy Media Holdings
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary																	5.00%
Payment received upon sale interest in subsidiary																								$ 15,000,000
Cash payment for acquisition of assets																	$ 32,000,000
Write-off of receivable due from Iconix India joint venture partner																									$ 17,000,000

[1] In March 2018, the Company formed the Starter China Limited as a wholly owned subsidiary to hold the Starter trademarks and related assets in respect of the Greater China territory. The Company entered into an agreement with Photosynthesis Holdings, Co. Ltd. (“PHL”) who will purchase no less than a 50% interest and up to a total of 60% interest in Starter China Limited. The purchase of the equity interest is expected to occur over a three-year period commencing on January 16, 2022. Refer to Note 4 for further details. As of December 31, 2019, the Company’s ownership interest in Starter China Limited was 100%.

[2] In June 2018, the Company formed the Lee Cooper China Limited as a wholly-owned subsidiary to hold the Lee Cooper trademarks and related assets in respect of the Greater China territory. The Company entered into an agreement with POS Lee Cooper HK Co. Ltd. (“PLC”) who will purchase no less than a 50% interest and up to a total of 60% interest in Lee Cooper China Limited. The purchase of the equity interest is expected to occur over a two-year period commencing on January 15, 2024. Refer to Note 4 for further details. As of December 31, 2019, the Company’s ownership interest in Lee Cooper China Limited was 100%.