Restatement of Previously Issued Financial Statements - Fourth Reconciliation Of Previously Reported And Restated Selected Financial Data - Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 01, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 169,971	$ 128,039	$ 278,789		$ 238,672
Restricted cash	49,544	59,560
Accounts receivable, net	103,792	112,347
Deferred income tax assets	2,381	10,328
Other assets – current	44,116	44,088
Total Current Assets	369,804	354,362
Property and equipment:
Furniture, fixtures and equipment	24,138	22,704
Less: Accumulated depreciation	(16,639)	(14,946)
Property, Plant and Equipment, Net, Total	7,499	7,758
Other Assets:
Other assets	28,748	51,865
Trademarks and other intangibles, net	1,696,524	1,996,334
Deferred financing costs, net	15,016	19,842
Investments and joint ventures	147,312	110,105
Goodwill	257,095	232,776	232,014
Other Assets, Total	2,144,695	2,410,922
Total Assets	2,521,998	2,773,042
Current liabilities:
Accounts payable and accrued expenses	52,062	38,655
Deferred revenue	29,161	25,868
Current portion of long-term debt	61,123	61,123
Other liabilities – current	3,571	6,403
Total current liabilities	145,917	132,049
Deferred income tax liability	183,574	299,982
Other tax liabilities	4,865
Long-term debt, less current maturities	1,403,285	1,332,954
Other liabilities	19,550	16,924
Total Liabilities	1,757,191	1,781,909
Redeemable Non-Controlling Interests, net of installment payments due from non-controlling interest holders	$ 69,902	$ 39,696
Commitments and contingencies
Stockholders’ Equity:
Common stock	$ 80	$ 79		$ 77
Additional paid-in capital	974,264	940,922		815,935
Retained earnings	514,761	713,819		509,605
Accumulated other comprehensive loss	(60,893)	(24,186)
Less: Treasury stock	(837,179)	(812,429)		(159,690)
Total Iconix Brand Group, Inc. Stockholders’ Equity	591,033	818,205		1,165,927
Non-controlling interests, net of installment payments due from non-controlling interest holders	103,872	133,232		111,439
Total Stockholders’ Equity	694,905	951,437	$ 1,060,497	1,277,366	$ 1,277,366
Total Liabilities, Redeemable Non-Controlling Interest and Stockholders’ Equity	$ 2,521,998	2,773,042
As Previously Reported
Current Assets:
Cash and cash equivalents		128,019
Restricted cash		59,560
Accounts receivable, net		115,066
Deferred income tax assets		10,328
Other assets – current		66,781
Total Current Assets		379,754
Property and equipment:
Furniture, fixtures and equipment		22,704
Less: Accumulated depreciation		(14,946)
Property, Plant and Equipment, Net, Total		7,758
Other Assets:
Other assets		63,334
Trademarks and other intangibles, net		2,024,541
Deferred financing costs, net		19,842
Investments and joint ventures		140,910
Goodwill		231,738
Other Assets, Total		2,480,365
Total Assets		2,867,877
Current liabilities:
Accounts payable and accrued expenses		38,762
Deferred revenue		24,978
Current portion of long-term debt		61,123
Other liabilities – current		12,741
Total current liabilities		137,604
Deferred income tax liability		320,792
Long-term debt, less current maturities		1,332,954
Other liabilities		11,660
Total Liabilities		1,803,010
Redeemable Non-Controlling Interests, net of installment payments due from non-controlling interest holders		$ 14,224
Commitments and contingencies
Stockholders’ Equity:
Common stock		$ 79		77
Additional paid-in capital		948,714		815,935
Retained earnings		805,526		529,829
Accumulated other comprehensive loss		(24,186)
Less: Treasury stock		(812,429)		(159,690)
Total Iconix Brand Group, Inc. Stockholders’ Equity		917,704		1,186,151
Non-controlling interests, net of installment payments due from non-controlling interest holders		132,939		113,689
Total Stockholders’ Equity		1,050,643		1,299,840
Total Liabilities, Redeemable Non-Controlling Interest and Stockholders’ Equity		2,867,877
Adjustments
Current Assets:
Cash and cash equivalents		20
Accounts receivable, net		(2,719)
Other assets – current		(22,693)
Total Current Assets		(25,392)
Other Assets:
Other assets		(11,469)
Trademarks and other intangibles, net		(28,207)
Investments and joint ventures		(30,805)
Goodwill		1,038
Other Assets, Total		(69,443)
Total Assets		(94,835)
Current liabilities:
Accounts payable and accrued expenses		(107)
Deferred revenue		890
Other liabilities – current		(6,338)
Total current liabilities		(5,555)
Deferred income tax liability		(20,810)
Other liabilities		5,264
Total Liabilities		(21,101)
Redeemable Non-Controlling Interests, net of installment payments due from non-controlling interest holders		$ 25,472
Commitments and contingencies
Stockholders’ Equity:
Additional paid-in capital		$ (7,792)
Retained earnings		(91,707)		(20,224)
Total Iconix Brand Group, Inc. Stockholders’ Equity		(99,499)		(20,224)
Non-controlling interests, net of installment payments due from non-controlling interest holders		293		(2,250)
Total Stockholders’ Equity		(99,206)		$ (22,474)
Total Liabilities, Redeemable Non-Controlling Interest and Stockholders’ Equity		$ (94,835)