Restatement of Previously Issued Financial Statements - Fourth Reconciliation Of Previously Reported And Restated Selected Financial Data - Stockholders' Equity (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jan. 01, 2013	Dec. 31, 2012
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
As Previously Reported
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
Adjustments
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)