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Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Deferred revenue	$ 3.0		$ 1.9
Barter sales revenue from Broadcasting Service	1.9	$ 2.6
Trade sales receivable	1.7		1.6
Trade sales payable	1.3		$ 1.3
Advertising Contracts [Member]
Losses on receivable from contracts	$ 0.2	$ 0.1

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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