Income Tax Provision (Benefit) for Federal, and State and Local Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015	[1]	Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014	[2]	Sep. 30, 2014	[2]	Jun. 30, 2014	[2]	Mar. 31, 2014	[2]	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Current income tax expense, Federal																	$ 6,927	$ 1,511	$ 8,817
Current income tax expense, State and local																	3,765	1,500	1,524
Current income tax expense, Foreign																	6,800	13,153	16,318
Total current																	17,492	16,164	26,659
Deferred:
Deferred income tax expense, Federal																	(110,705)	27,705	21,870
Deferred income tax expense, State and local																	(431)	3,996	630
Deferred income tax expense, Foreign																	(1,700)	423	436
Total deferred																	(112,836)	32,124	22,936
Provision (benefit) for income taxes	$ (140,427)		$ 6,275		$ 11,536		$ 27,272		$ 5,210		$ 8,867		$ 14,213		$ 19,998		$ (95,344)	$ 48,288	$ 49,595

[1] FY 2015: Operating income (loss), net includes a non-cash impairment charge of $437.5 million primarily related to the men’s brands recorded in the fourth quarter. Included in net income (loss) attributable to Iconix Brand Group, Inc. is a non-cash pre-tax re-measurement gain of approximately $50.0 million related to the purchase of the remaining interest in Iconix China in the first quarter.

[2] FY 2014 (Restated): Operating income, net includes a net gain of $6.4 million on the sale of the “sharperimage.com” domain name and certain categories under the Sharper Image trademark in the second quarter. Included in net income attributable to Iconix Brand Group, Inc is a non-cash pre-tax re-measurement gain of approximately $34.7 million related to the purchase of the remaining interest in Iconix Latin America in the first quarter.