Other Assets - Current (Parenthetical) (Detail) - DHX Media, Ltd. - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2017
Prepaid Expenses And Other Current Assets [Line Items]
Working capital adjustment from the sale of the entertainment segment		$ 2.7
Transitional service agreement and other payroll, infrastructure and IT expenses	$ 2.2

Transitional service agreement and other payroll, infrastructure and IT expenses.

No definition available.

Name:	icon_TransitionalServiceAgreementAndOtherPayrollInfrastructureAndITExpenses
Namespace Prefix:	icon_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration