Schedule of Other Revenue (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended														12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Revenue [Line Items]
Other revenue	$ 10,251	[1]	$ 18,680	[1]	$ 21,401	[1]	$ 3,971	[1]	$ 16,999	[2]	$ 7,811	[2]	$ 9,769	[2]	$ 54,303		$ 34,579		$ 12,133
LC Partners U.S. LLC
Revenue [Line Items]
Other revenue															3,971
Sharper Image
Revenue [Line Items]
Other revenue															7,787	[3]
Iconix SE Asia - June 2014
Revenue [Line Items]
Other revenue															13,614
Iconix SE Asia - September 2014
Revenue [Line Items]
Other revenue															18,652
Iconix Middle East
Revenue [Line Items]
Other revenue															10,279
Iconix Canada
Revenue [Line Items]
Other revenue																	9,769
Iconix Australia
Revenue [Line Items]
Other revenue																	5,140
Other Segment
Revenue [Line Items]
Other revenue																	2,671
Iconix Israel
Revenue [Line Items]
Other revenue																	2,350
Iconix Southeast Asia
Revenue [Line Items]
Other revenue																	4,649
Umbro | Korea
Revenue [Line Items]
Other revenue																	10,000	[4]
Iconix India
Revenue [Line Items]
Other revenue																			5,631
OP Japan
Revenue [Line Items]
Other revenue																			$ 6,502	[5]

[1] FY 2014: Other revenue includes a net gain of approximately $4.0 million related to the Iconix LC Partners U.S. transaction in the first quarter, a net gain of approximately $13.6 million and $18.7 million related to additional Iconix SE Asia transactions in the second and third quarter, respectively, a net gain of $7.8 million on the sale of the "sharperimage.com" domain name and certain categories under the Sharper Image trademark in the second quarter, and net gain of $10.3 million related to the Iconix Middle East transaction in the fourth quarter. See Note 3 for a description of these transactions. Included in net income attributable to Iconix Brand Group, Inc is a non-cash pre-tax remeasurement gain of approximately $37.9 million related to the purchase of the remaining interest in Iconix Latin America in the first quarter.

[2] FY 2013: Other revenue includes a net gain of approximately $9.8 million related to the Iconix Canada transaction in the second quarter, a net gain of approximately $5.1 million related to the Iconix Australia transaction in the third quarter, and net gains of $4.7 million, $2.3 million, and $10.0 million related to the Iconix SE Asia, Iconix Israel and Umbro Korea transactions, respectively, in the fourth quarter. See Note 3 for a description of these transactions.

[3] FY 2014 includes a net gain of $7.8 million on the sale of the "sharperimage.com" domain name and certain categories under the Sharper Image trademark

[4] FY 2013 includes a gain of $10.0 million on the sale of the Umbro trademark for the Korea territory

[5] FY 2012 includes a net gain of approximately $6.5 million related to the OP Japan transaction in the fourth quarter.