Acquisitions, Joint Ventures and Investments - Additional Information (Detail) ₨ in Millions								1 Months Ended																													3 Months Ended			12 Months Ended
		Mar. 31, 2016 USD ($)	Jul. 06, 2015 USD ($)	Apr. 26, 2011 USD ($)	Jun. 03, 2010 USD ($)	Dec. 29, 2008 USD ($)	Nov. 07, 2007 USD ($)	Jan. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Feb. 28, 2015 USD ($)	Dec. 31, 2014 USD ($)	Oct. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jul. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($) Installment	Feb. 28, 2014 USD ($)	Jan. 31, 2014 USD ($)	Nov. 30, 2013 USD ($)	Oct. 31, 2013 USD ($) Installment	Sep. 30, 2013 USD ($)	Jul. 31, 2013 USD ($)	Jun. 30, 2013 USD ($)	Feb. 28, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 30, 2012 USD ($)	May. 31, 2012 USD ($)	May. 31, 2011 USD ($)	Jan. 31, 2011 USD ($)	Jul. 31, 2010 USD ($)	Jun. 30, 2010 USD ($)	Mar. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	May. 31, 2009 USD ($) shares	Sep. 30, 2008 USD ($)	Mar. 31, 2016 USD ($) Multiplier	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2015	Jun. 30, 2013 INR (₨)	Sep. 30, 2009 USD ($)	Mar. 31, 2009
Schedule Of Investments [Line Items]
Agreement Percentage																					120.00%
Accretion period of difference between fair value of put option and non-controlling interest at inception																					5 years
Royalty revenue																																					$ 5,742,000
Note receivable	[1]	$ 4,810,000							$ 5,000,000																												4,810,000	$ 5,000,000
Non-cash pre-tax re-measurement gain																																							$ 49,990,000
Goodwill		257,095,000							257,095,000																												257,095,000	257,095,000
Additional paid-in capital		976,324,000							974,264,000																												976,324,000	$ 974,264,000
Acquisition of interest in MG Icon																																					23,000,000
Other Liabilities-Current
Schedule Of Investments [Line Items]
Amount to be paid to seller		0																																			0
Lee Cooper And Umbro Brands
Schedule Of Investments [Line Items]
Business acquisition total purchase price									24,700,000
Business acquisition purchase price, cash paid									$ 3,500,000
Percentage of interest sold in equity method investment									50.00%																													50.00%
Company purchased the Umbro China and Lee Cooper brands									$ 24,700,000
Note receivable									$ 9,400,000																													$ 9,400,000
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																																			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																																			5,400,000
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%
Five-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option period																					6 months
Put/Call option commencement date																					Sep. 17, 2019
Eight-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option period																					6 months
Put/Call option commencement date																					Sep. 17, 2022
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		$ 6,100,000										$ 12,500,000																									$ 6,100,000			12,500,000
Committed amount receivable period												24 months
Payment made to subsidiary for diligence and Market analysis												$ 3,100,000																												3,100,000
Agreement Percentage		120.00%																																			120.00%
Accretion period of difference between fair value of put option and non-controlling interest at inception																																					5 years
Iconix Middle East | Two Year Call Option
Schedule Of Investments [Line Items]
Call option period												6 months
Call option commencement date												Dec. 19, 2016
Payment for the purchased call option												$ 1,800,000
Iconix Middle East | Five-Year Put/Call Options
Schedule Of Investments [Line Items]
Call option period																																					6 months
Call option commencement date																																					Dec. 19, 2019
Multiplier on put and call options | Multiplier																																					5.5
Iconix Middle East | Eight-Year Put/Call Options
Schedule Of Investments [Line Items]
Call option period																																					6 months
Call option commencement date																																					Dec. 19, 2022
Multiplier on put and call options | Multiplier																																					5.5
Iconix Middle East | Maximum | Two Year Call Option
Schedule Of Investments [Line Items]
Percentage of equity interest subject to call option												5.00%
Iconix Middle East | Minimum | Five-Year Put/Call Options
Schedule Of Investments [Line Items]
Royalty revenue																																					$ 12,000,000
Iconix Middle East | Minimum | Eight-Year Put/Call Options
Schedule Of Investments [Line Items]
Royalty revenue																																					12,000,000
LC Partners U.S. LLC
Schedule Of Investments [Line Items]
Percentage of interest sold in equity method investment																	50.00%
Agreed price for sale of interest in a subsidiary																	$ 4,000,000
Payment received upon sale interest in subsidiary																																								800,000
Receivable for investments sold		$ 2,400,000															$ 3,200,000																				$ 2,400,000
Accretion period of difference between fair value of put option and non-controlling interest at inception																																					6 years
Multiplier on put and call options | Multiplier																																					5
Number of equal annual installments | Installment																	4
Equity method investment put option value multiplier times net wholesale sales | Multiplier																																					0.10
LC Partners U.S. LLC | Put Option
Schedule Of Investments [Line Items]
Payment for the purchased call option																																					$ 4,000,000
Iconix Israel
Schedule Of Investments [Line Items]
Percentage of interest sold in equity method investment																				50.00%
Payment received upon sale interest in subsidiary																				$ 1,000,000
Receivable for investments sold		600,000																		$ 2,300,000																	$ 600,000
Committed amount receivable period																				36 months
Percentage of equity interest subject to call option																				5.00%
Price for sale of interest in a subsidiary																				$ 3,300,000
Iconix Israel | Call Option | Multiplier Rate One
Schedule Of Investments [Line Items]
Multiplier on put and call options | Multiplier																																					0.05
Iconix Israel | Call Option | Multiplier Rate Two
Schedule Of Investments [Line Items]
Multiplier on put and call options | Multiplier																																					6.5
Iconix Southeast Asia
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		7,800,000																			$ 4,500,000																$ 7,800,000
Committed amount receivable period																					24 months
Agreement Percentage																					120.00%
Accretion period of difference between fair value of put option and non-controlling interest at inception																					5 years
Price for sale of interest in a subsidiary																					$ 12,000,000
Business acquisition transaction costs																					$ 2,000,000
Marketing costs incurred																																					$ 5,400,000
Consulting costs																																									$ 2,000,000
Iconix Southeast Asia | 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 Southeast Asia | Administrative Manager
Schedule Of Investments [Line Items]
Percentage of gross revenue paid monthly as services fee																																					5.00%
Iconix Southeast Asia | Local Manager
Schedule Of Investments [Line Items]
Percentage of gross revenue paid monthly as services fee																																					15.00%
Iconix Southeast Asia | Two Year Call Option
Schedule Of Investments [Line Items]
Call option period																					6 months
Call option commencement date																					Oct. 01, 2015
Payment for the purchased call option																																					$ 38,400,000
Iconix Southeast Asia | Two Year Call Option | Multiplier Rate One
Schedule Of Investments [Line Items]
Multiplier on put and call options | Multiplier																																					0.10
Iconix Southeast Asia | Two Year Call Option | Multiplier Rate Two
Schedule Of Investments [Line Items]
Multiplier on put and call options | Multiplier																																					1.15
Iconix Southeast Asia | Five-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option period																					6 months
Put/Call option commencement date																					Oct. 01, 2018
Iconix Southeast Asia | Five-Year Put/Call Options | Europe
Schedule Of Investments [Line Items]
Multiplier on put and call options | Multiplier																																					5.5
Iconix Southeast Asia | 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 Southeast Asia | Eight-Year Put/Call Options | Europe
Schedule Of Investments [Line Items]
Multiplier on put and call options | Multiplier																																					5.5
Iconix Southeast Asia | Maximum | Two Year Call Option
Schedule Of Investments [Line Items]
Percentage of equity interest subject to call option																					5.00%
Iconix Southeast Asia | Minimum | Guarantee of Business Revenue
Schedule Of Investments [Line Items]
Guaranteed minimum distributions		2,500,000																																			$ 2,500,000
Iconix Southeast Asia | Minimum | Five-Year Put/Call Options
Schedule Of Investments [Line Items]
Agreed Value		15,500,000																																			15,500,000
Iconix Southeast Asia | Minimum | Five-Year Put/Call Options | Europe
Schedule Of Investments [Line Items]
Agreed Value		7,600,000																																			7,600,000
Iconix Southeast Asia | Minimum | Eight-Year Put/Call Options | Europe
Schedule Of Investments [Line Items]
Agreed Value		7,600,000																																			7,600,000
Iconix Canada
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																								$ 17,800,000
Payment received upon sale interest in subsidiary																								8,900,000
Receivable for investments sold		5,800,000																						$ 8,900,000													$ 5,800,000
Committed amount receivable period																								5 years
Option to purchase Encumbered Canadian Assets description																																					Ico Brands has an option to purchase the Encumbered Canadian Assets for one dollar within one year following the earlier of (i) January 15, 2020 and (ii) the later of (a) the release of such assets from the Company’s securitization and (b) Ico Brands receipt of notice of such release.
Option to purchase Encumbered Canadian Assets price		1
Liquidated damages obligation		4,900,000																																			$ 4,900,000
Iconix Canada | Guarantee of Business Revenue
Schedule Of Investments [Line Items]
Royalty revenue																								$ 2,700,000
Iconix Canada | Call Option
Schedule Of Investments [Line Items]
Percentage of equity interest subject to call option																																					5.00%
Payment for the purchased call option																																					$ 1,500,000
Multiplier on put and call options | Multiplier																																					5.5
Percentage of amount obtained for options																																					5.00%
Iconix Europe
Schedule Of Investments [Line Items]
Controlling interest																			1.00%
Equity interest acquired																			51.00%
Percentage of minority interest in subsidiary																			49.00%
Percentage of interest sold in equity method investment																																		50.00%
Agreed price for sale of interest in a subsidiary																																		$ 4,000,000
Payment received upon sale interest in subsidiary																			$ 1,500,000											$ 1,000,000				$ 3,000,000
Preferred profit distribution to the Company																			3,000,000
Scion
Schedule Of Investments [Line Items]
Controlling interest			50.00%
Business acquisition purchase price, cash paid			$ 6,000,000
Equity interest acquired			100.00%
Decrease in restricted cash															$ 8,500,000
Allowance for doubtful accounts												$ 2,700,000																												2,700,000
Decrease in accounts receivable												$ 5,800,000																												$ 5,800,000
Write down value of receivable																																						$ 3,800,000
Additional paid-in capital			$ 800,000
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 Australia | Two Year Call Option
Schedule Of Investments [Line Items]
Call option period																						6 months
Call option commencement date																						Sep. 17, 2015
Multiplier on put and call options | Multiplier																																					6.5
Iconix Australia | Five-Year Put/Call Options
Schedule Of Investments [Line Items]
Put/Call option commencement date																						Sep. 17, 2017
Iconix Australia | Four Year Put And Call Option
Schedule Of Investments [Line Items]
Multiplier on put and call options | Multiplier																																					5
Iconix Australia | Maximum | Two Year Call Option
Schedule Of Investments [Line Items]
Percentage of equity interest subject to call option																						5.00%
Iconix Lifestyle India Private Limited
Schedule Of Investments [Line Items]
Percentage of interest sold in equity method investment																								50.00%																			50.00%
Receivable for investments sold																								$ 4,000,000
Price for sale of interest in a subsidiary																								6,000,000
Note receivable		1,900,000																																			$ 1,900,000
Net gain recognized on sale of interest in subsidiary																																									$ 2,300,000
Iconix Lifestyle India Private Limited | Other assets - current
Schedule Of Investments [Line Items]
Note receivable		1,000,000																																			1,000,000
Iconix Lifestyle India Private Limited | Other Assets
Schedule Of Investments [Line Items]
Note receivable		$ 900,000																																			$ 900,000
Iconix China
Schedule Of Investments [Line Items]
Controlling interest										50.00%																													50.00%
Business acquisition total purchase price										$ 57,400,000
Business acquisition purchase price, cash paid										40,400,000
Business acquisition purchase price, common stock issued, value										$ 15,700,000
Equity interest acquired		100.00%								100.00%																											100.00%		100.00%
Goodwill		$ 9,600,000																																			$ 9,600,000
Investments in private companies		38,870,000																																			38,870,000
Company purchased the Umbro China and Lee Cooper brands																																							$ 20,400,000
Non-cash pre-tax re-measurement gain																																					49,990,000
Goodwill		9,639,000																																			9,639,000
Strawberry Shortcake
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid										$ 105,000,000																													95,000,000
Goodwill		35,400,000																																			$ 35,400,000
Quarterly installment period																																					2 years
Goodwill										35,375,000																													35,375,000
Strawberry Shortcake | Notes Receivable
Schedule Of Investments [Line Items]
Notes receivable principal amount										10,000,000																													10,000,000
Pony International, LLC.
Schedule Of Investments [Line Items]
Controlling interest											75.00%
Business acquisition purchase price, cash paid											$ 37,000,000																												37,000,000
Goodwill		14,700,000																																			$ 14,700,000
Percentage of minority interest in subsidiary											25.00%
Goodwill											$ 14,702,000
Artful Dodger | Scion
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid							$ 15,000,000
BBC Ice Cream LLC
Schedule Of Investments [Line Items]
Controlling interest			50.00%
BBC Ice Cream LLC | Scion
Schedule Of Investments [Line Items]
Proceeds from sale of acquisition								$ 3,500,000
Artful Holdings LLC
Schedule Of Investments [Line Items]
Controlling interest			100.00%
Equity method of accounting | Iconix Lifestyle India Private Limited
Schedule Of Investments [Line Items]
Payment received upon sale interest in subsidiary																								$ 2,000,000
Committed amount receivable period																								48 months
Cost method of accounting | Scion | Variable Interest Entity, Not Primary Beneficiary
Schedule Of Investments [Line Items]
Controlling interest																																													16.60%
Cash collateral deposited under the terms of the entity's financing agreements																			$ 11,800,000
Cash collateral released and distributed to the Scion members																																$ 3,300,000
Novel | Iconix China
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid										40,400,000
Offset of accounts receivable										1,269,000																													$ 1,269,000
Novel | Equity method of accounting
Schedule Of Investments [Line Items]
Committed contribution to joint venture																																				$ 20,000,000								$ 9,000,000
Cash payment for acquisition of assets																											$ 2,000,000		$ 3,000,000		$ 4,000,000					8,000,000
LF Centennial Limited | Iconix Southeast Asia
Schedule Of Investments [Line Items]
Cost of brand strategy services																					$ 500,000
Number of installments | Installment																					4
Beagle Scout LLC | Peanuts Worldwide
Schedule Of Investments [Line Items]
Cash payment for acquisition of assets					$ 34,000,000
Percentage of minority interest in subsidiary					20.00%
Notes loaned to subsidiary					$ 17,500,000
Notes receivable, annual interest rate					6.00%
Notes receivable, minimum principal annual installments					$ 2,200,000
Notes receivable, maturity date					Jun. 03, 2015
Parent Company | Equity method of accounting
Schedule Of Investments [Line Items]
Committed contribution to joint venture																																				5,000,000
Cash payment for acquisition of assets																																				$ 2,000,000
Additional amount agreed to be contributed as working capital																								$ 2,000,000																			₨ 100
American Greetings Corporation | Strawberry Shortcake
Schedule Of Investments [Line Items]
Business acquisition purchase price, cash paid										$ 95,000,000
Iconix Brands Lp | Call Option
Schedule Of Investments [Line Items]
Percentage of equity interest subject to call option																																					5.00%
Payment for the purchased call option																																					$ 600,000
Multiplier on put and call options | Multiplier																																					5.5
Percentage of amount obtained for options																																					5.00%
Iconix Latin America
Schedule Of Investments [Line Items]
Controlling interest																		50.00%
Business acquisition purchase price, cash paid																		$ 42,000,000
Equity interest acquired																		100.00%
Goodwill																		$ 1,100,000
Percentage of interest sold in equity method investment						50.00%
Agreed price for sale of interest in a subsidiary						$ 6,000,000
Payment received upon sale interest in subsidiary						1,000,000
Receivable for investments sold						$ 5,000,000
Committed amount receivable period						30 months
Non-cash pre-tax re-measurement gain																		$ 34,700,000
Hydraulic IP Holdings
Schedule Of Investments [Line Items]
Controlling interest												51.00%																												51.00%
Business acquisition purchase price, cash paid												$ 6,000,000
Hydraulic IP Holdings | Top On International Group, LLC
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary												49.00%																												49.00%
NGX LLC
Schedule Of Investments [Line Items]
Controlling interest													51.00%
Business acquisition purchase price, cash paid													$ 6,000,000
NGX LLC | NGO LLC
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary													49.00%
Alberta ULC
Schedule Of Investments [Line Items]
Controlling interest																									51.00%
Business acquisition purchase price, cash paid																									$ 76,500,000
Buffalo International Unlimited Liability Corporation
Schedule Of Investments [Line Items]
Percentage of minority interest in subsidiary																									49.00%
Receivable for investments sold		$ 5,700,000																																			$ 5,700,000
Note receivable																									$ 36,900,000
Goodwill																									$ 7,100,000
Modern Amusement | Equity method of accounting
Schedule Of Investments [Line Items]
Controlling interest																										51.00%
Business acquisition purchase price, cash paid																										$ 5,000,000
Icon Entertainment LLC | Peanuts Worldwide
Schedule Of Investments [Line Items]
Cash payment for acquisition of assets					$ 141,000,000
Controlling interest					80.00%
Business acquisition purchase price, cash paid					$ 172,100,000
Hardy Way
Schedule Of Investments [Line Items]
Controlling interest				85.00%
Business acquisition total purchase price				$ 62,000,000
Hardy Way | Equity method of accounting
Schedule Of Investments [Line Items]
Controlling interest																																			50.00%
Business acquisition total purchase price																																			$ 17,000,000
Business acquisition purchase price, cash paid																																			9,000,000
Business acquisition purchase price, common stock issued, value																																			$ 8,000,000
Business acquisition purchase price, common stock issued, shares | shares																																			588,688
Hardy Way | Equity method of accounting | Addition capital
Schedule Of Investments [Line Items]
Business acquisition purchase price, common stock issued, value																																			$ 1,000,000
Scion BBC LLC | BBC Ice Cream LLC
Schedule Of Investments [Line Items]
Controlling interest																												50.00%
Business acquisition purchase price, cash paid																												$ 3,500,000
Reliance Brands Limited | Equity method of accounting
Schedule Of Investments [Line Items]
Additional amount agreed to be contributed as working capital																								$ 500,000																			₨ 25
MG Icon | Equity method of accounting
Schedule Of Investments [Line Items]
Controlling interest																																	50.00%
Business acquisition total purchase price																																	$ 20,000,000
Acquisition of interest in MG Icon																																	4,000,000
Amount to be paid to seller																																	$ 3,000,000
MG Icon | Equity method of accounting | Minimum
Schedule Of Investments [Line Items]
Preferred profit distribution to the Company																																					$ 23,000,000
Marcy Media Holdings
Schedule Of Investments [Line Items]
Cash payment for acquisition of assets																							$ 32,000,000
Percentage of minority interest in subsidiary																							5.00%
Complex Media Inc.
Schedule Of Investments [Line Items]
Cash payment for acquisition of assets																						$ 25,000,000
Percentage of minority interest in subsidiary																						14.40%																				11.80%

[1] The Note receivable in connection with the Strawberry Shortcake acquisition represents amounts due from AG in respect of non-compete payments pursuant to a License Agreement entered into with AG simultaneously with the closing of the transaction.