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