Reconciliation of Consideration Paid and Estimated Fair Value of Assets Acquired (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Mar. 31, 2015	Feb. 28, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Gain on re-measurement of initial equity investment				$ 49,990
Goodwill			$ 257,095		$ 257,095
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			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
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