With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Jun. 11, 2018	Jan. 16, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Total net revenue			$ 74,575	$ 334,555	$ 215,742	$ 462,574
Expenses			68,560	$ 77,573	$ 200,268	$ 188,284
KMCC-TV
Business Acquisition [Line Items]
Business acquisition date					Jan. 16, 2018
Aggregate cash consideration		$ 3,600
Business acquisition description of acquired entity					the Company completed the acquisition of television station KMCC-TV, which serves the Las Vegas, Nevada area
Smadex
Business Acquisition [Line Items]
Business acquisition date					Jun. 11, 2018
Aggregate cash consideration	$ 3,500
Ownership Interest acquired	100.00%
Cash acquired	$ 1,200
Accounts receivables assets acquired, fair value	900
Gross amount account receivables asset acquired	$ 900
Total net revenue			3,500		$ 3,900
Expenses			$ 3,200		3,700
Acquisition fees and costs					$ 400