Related-Party Transactions - Summary of Related-Party Balances with Univision and Other Related Parties (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Trade receivables	$ 84,348	$ 65,072
Other current assets	6,260	4,870
Intangible assets subject to amortization, net	26,758	13,120
Accounts payable	59,522	30,810
Direct operating expenses	119,283	113,439	$ 110,323
Amortization	16,411	15,342	15,989
Univision
Related Party Transaction [Line Items]
Trade receivables	4,653	7,357
Intangible assets subject to amortization, net	9,555	11,598
Accounts payable	2,430	3,768
Direct operating expenses	9,494	10,302	9,306
Amortization	2,043	2,320	2,321
Other
Related Party Transaction [Line Items]
Other current assets	274	274
Accounts payable	118	118
Related Parties
Related Party Transaction [Line Items]
Trade receivables	4,653	7,357
Other current assets	274	274
Intangible assets subject to amortization, net	9,555	11,598
Accounts payable	2,548	3,886
Direct operating expenses	9,494	10,302	9,306
Amortization	$ 2,043	$ 2,320	$ 2,321

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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