Reconciliation of Consideration Paid and Estimated Fair Value of Assets Acquired (Detail) - USD ($) $ in Thousands	1 Months Ended				3 Months Ended	12 Months Ended
	Mar. 31, 2015	Feb. 28, 2015	Feb. 28, 2014	Jan. 31, 2014	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Gain on re-measurement of initial equity investment							$ 49,990	$ 28,898
Goodwill						$ 224,279	257,095	$ 232,776
Iconix Latin America
Business Acquisition [Line Items]
Business acquisition purchase price, cash paid			$ 42,000
Fair Value of non-controlling interest			42,698
Less: note receivable owed to the Company			(1,695)
Add: accrued distributions due to New Brands			997
Book value of Company equity investment prior to 2015 Buy-out			7,950
Gain on re-measurement of initial equity investment			34,748
Business Combination Reconciliation of Cash Paid and Fair Value of Sellers Non-controlling Interest			85,396
Trademarks			82,400
Cash			1,842
Working capital deficit			(676)
Goodwill			1,130
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net			85,396
Iconix Europe
Business Acquisition [Line Items]
Fair Value of non-controlling interest				$ 13,800
Book value of Company equity investment prior to 2015 Buy-out				19,651
Loss on re-measurement of initial equity investment				(5,851)
Business Combination Reconciliation of Cash Paid and Fair Value of Sellers Non-controlling Interest				27,600
Trademarks				27,000
Cash				677
Working capital deficit				(77)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net				$ 27,600
Licensing contracts | Iconix Latin America
Business Acquisition [Line Items]
Finite intangible assets			$ 700
Pony International, LLC.
Business Acquisition [Line Items]
Business acquisition purchase price, cash paid		$ 37,000					37,000
Fair Value of non-controlling interest		12,333
Trademarks		32,381
Accounts receivable		2,000
Goodwill		14,702
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		49,333
Pony International, LLC. | Licensing contracts
Business Acquisition [Line Items]
Finite intangible assets		$ 250
Iconix China
Business Acquisition [Line Items]
Business acquisition purchase price, cash paid	$ 40,400
Fair Value of non-controlling interest	57,372				$ 57,372	57,372
Book value of Company equity investment prior to 2015 Buy-out						7,382
Gain on re-measurement of initial equity investment					50,000	49,990
Business Combination Reconciliation of Cash Paid and Fair Value of Sellers Non-controlling Interest						114,744
Trademarks						40,501
Investments in private companies						38,870	38,900
Cash						20,184
Other assets						5,997
Accrued expenses						(447)
Goodwill						9,639
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net						$ 114,744
Iconix China | Novel
Business Acquisition [Line Items]
Business acquisition purchase price, cash paid	40,400
Shares issued	15,703				15,703
Offset of accounts receivable	1,269				1,269
Strawberry Shortcake
Business Acquisition [Line Items]
Business acquisition purchase price, cash paid	105,000						$ 95,000
Trademarks	55,761				55,761
Accounts receivable	3,397				3,397
Goodwill	35,375				35,375
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	95,000				95,000
Strawberry Shortcake | American Greetings Corporation
Business Acquisition [Line Items]
Business acquisition purchase price, cash paid	95,000
Strawberry Shortcake | Licensing contracts
Business Acquisition [Line Items]
Finite intangible assets	$ 467				$ 467