Other Assets - Current (Parenthetical) (Detail) $ in Millions	6 Months Ended
Dec. 31, 2017 USD ($)
DHX Media, Ltd.
Prepaid Expenses And Other Current Assets [Line Items]
Transitional service agreement and other infrastructure and IT expenses	$ 1.2

Transitional service agreement and other infrastructure and IT expenses.

No definition available.

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