Net Revenues by Type of License and Information by Geographic Region (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		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Licensing revenue	$ 102,161	[1]	$ 95,070	[1]	$ 97,542	[1]	$ 112,167	[1]	$ 88,265	[2]	$ 99,364	[2]	$ 105,356	[2]	$ 105,062	[2]	$ 406,940		$ 398,047		$ 341,685
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
Total revenue																	461,243		432,626		353,818
Operating Segment
Segment Reporting Information [Line Items]
Other revenue																	54,303		34,579		12,133
Operating Segment | United States
Segment Reporting Information [Line Items]
Total revenue																	293,134		292,619		273,903
Operating Segment | Japan
Segment Reporting Information [Line Items]
Total revenue																	30,168		29,734		36,432
Operating Segment | Other
Segment Reporting Information [Line Items]
Total revenue																	137,941	[3]	110,273	[3]	43,483	[3]
Operating Segment | Reportable Segment | Mens
Segment Reporting Information [Line Items]
Licensing revenue																	111,693		143,916		99,093
Operating Segment | Reportable Segment | Womens
Segment Reporting Information [Line Items]
Licensing revenue																	148,482		138,262		120,743
Operating Segment | Reportable Segment | Home
Segment Reporting Information [Line Items]
Licensing revenue																	43,694		40,920		40,527
Operating Segment | Reportable Segment | Entertainment
Segment Reporting Information [Line Items]
Licensing revenue																	103,071		74,949		81,322
Operating Segment | Reportable Segment | Direct-to-retail license
Segment Reporting Information [Line Items]
Licensing revenue																	150,868		147,846		150,245
Operating Segment | Reportable Segment | Wholesale licenses
Segment Reporting Information [Line Items]
Licensing revenue																	195,210		225,186		165,082
Operating Segment | Reportable Segment | Other licenses
Segment Reporting Information [Line Items]
Licensing revenue																	$ 60,862		$ 25,015		$ 26,358

[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] No single country represented 10% of the Company's revenues in the periods presented within "Other" on this table.