Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Dec. 31, 2015 USD ($) Entity	Jun. 30, 2015 Segment	Mar. 31, 2015 USD ($) Segment	Dec. 31, 2015 USD ($) Entity	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Feb. 28, 2015 USD ($)	Feb. 28, 2014 USD ($)
Significant Accounting Policies [Line Items]
Number of consolidated joint ventures | Entity	15			15
Percentage of cash including restricted cash held in foreign subsidiaries	38.20%			38.20%
Allowance for doubtful accounts	$ 8,400,000			$ 8,400,000	$ 8,700,000
Derivative instruments, fair value	0			0	0
Impairment of long-lived assets				0	0	$ 0
Number of reportable segments | Segment		5	1
Non-cash impairment charge	35,100,000			35,132,000
Trademark impairment	$ 402,400,000			402,392,000	0	0
Advertising expenses				$ 32,300,000	$ 29,700,000	$ 25,900,000
2.50% Convertible Notes Due June 2016
Significant Accounting Policies [Line Items]
Debt instrument for refinancing, interest rate	2.50%			2.50%
Debt instrument for refinancing, maturity date				Jun. 30, 2016
Men's
Significant Accounting Policies [Line Items]
Non-cash impairment charge	$ 35,100,000
Women's
Significant Accounting Policies [Line Items]
Non-cash impairment charge	0
Home
Significant Accounting Policies [Line Items]
Non-cash impairment charge	0
Entertainment
Significant Accounting Policies [Line Items]
Non-cash impairment charge	0
Corporate
Significant Accounting Policies [Line Items]
Non-cash impairment charge	0
Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				3 years
Finite-lived intangible assets, useful life				1 year
Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life				7 years
Finite-lived intangible assets, useful life				15 years
Sales Revenue, Services, Net | Customer 1 | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, percentage				14.00%	14.00%	14.00%
Accounts Receivable | Customer 1 | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, percentage				10.00%	14.00%
Accounts Receivable | Customer 2 | Customer Concentration Risk
Significant Accounting Policies [Line Items]
Concentration risk, percentage					11.00%
Subsidiaries | Non Us
Significant Accounting Policies [Line Items]
Cash including restricted cash	$ 83,900,000			$ 83,900,000
Iconix China
Significant Accounting Policies [Line Items]
Interest acquired, including previously acquired interest	100.00%		100.00%	100.00%
Purchase price allocation goodwill amount	$ 9,600,000		$ 9,600,000	$ 9,600,000
Controlling interest			50.00%
Iconix Latin America
Significant Accounting Policies [Line Items]
Interest acquired, including previously acquired interest								100.00%
Purchase price allocation goodwill amount								$ 1,100,000
Controlling interest								50.00%
PONY Brand
Significant Accounting Policies [Line Items]
Purchase price allocation goodwill amount							$ 14,700,000
Strawberry Shortcake Brand
Significant Accounting Policies [Line Items]
Purchase price allocation goodwill amount			$ 35,400,000