Discontinued Operations - Summary of Financial Results of Entertainment Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other expenses (income):
Net income (loss) from discontinued operations	$ (7,379)	$ 5,465
Less: Net income attributable to non-controlling interest from discontinued operations	1,303	1,478
Net income (loss) from discontinued operations attributable to Iconix Brand Group, Inc.	(8,682)	3,987
Operating Segments | Entertainment
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Licensing revenue	27,461	26,956
Selling, general and administrative expenses	17,850	18,888
Depreciation and amortization	185	132
Operating income	9,426	7,936
Other expenses (income):
Interest expense	6,122	1,692
Interest income	(99)	(183)
Loss on extinguishment of debt	15,737
Foreign currency translation loss (gain)	143	(810)
Other expenses – net	21,903	699
Income (loss) from operations of discontinued operations before income taxes	(12,477)	7,237
Provision (benefit) for income taxes	(5,098)	1,772
Net income (loss) from discontinued operations	(7,379)	5,465
Less: Net income attributable to non-controlling interest from discontinued operations	1,303	1,478
Net income (loss) from discontinued operations attributable to Iconix Brand Group, Inc.	$ (8,682)	$ 3,987