Other Assets - Current (Parenthetical) (Detail) $ in Millions	3 Months Ended
Mar. 31, 2018 USD ($)
DHX Media, Ltd.
Prepaid Expenses And Other Current Assets [Line Items]
Transitional service agreement and other expenses	$ 0.7

Transitional service agreement and other expenses.

No definition available.

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