Valuation and Qualifying Accounts (Detail) - Allowance For Doubtful Accounts - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	[1],[2]	$ 16,409	$ 8,385	$ 8,738
Additions Charged to Costs and Expenses	[1],[2]	5,794	13,530	25,128
Deductions	[1],[2]	(14,281)	(5,506)	(25,481)
Balance at End of Period	[1],[2]	$ 7,922	$ 16,409	$ 8,385

[1] For the year ended December 31, 2017, deductions include an impact of $0.4 million for the sale of NGX and the deconsolidation of Iconix Southeast Asia. See Note 4 to Notes to Consolidated Financial Statements for further details. For the year ended December 31, 2016, deductions include an impact of $3.0 million from the sale of the Entertainment segment as the assets were classified as held for sale in the Company’s consolidated balance sheet as December 31, 2016. See Note 2 to Notes to Consolidated Financial Statements for further details.

[2] These amounts include reserves for bad debts.