Other Assets - Current (Parenthetical) (Detail) $ in Millions	9 Months Ended
Sep. 30, 2018 USD ($)
DHX Media, Ltd.
Prepaid Expenses And Other Current Assets [Line Items]
Transitional service agreement and other expenses	$ 1.2

Transitional service agreement and other expenses.

No definition available.

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