Impact of Recently Issued Accounting Standards - Additional Information (Detail) - USD ($)		3 Months Ended		12 Months Ended
		Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated deficit		$ (225,881,000)			$ (225,881,000)	$ (132,013,000)
Income tax (benefit) expense					(44,921,000)	15,131,000	$ 22,594,000
Increase in non-current deferred tax assets		115,436,000			115,436,000	298,757,000
Decrease in other current prepaid asset		26,644,000			26,644,000	21,163,000
Goodwill impairment					51,200,000	0	$ 0
Cumulative effect adjustment	[1]				10,974,000
Cloud Tv Reporting Unit
Goodwill impairment		51,200,000			51,200,000
Cloud Tv Reporting Unit | Non-controlling Interest
Goodwill impairment		$ 17,900,000			17,900,000
Accounting Standards Update 2016-09 [Member]
Income tax (benefit) expense					$ (2,600,000)
Accounting Standards Update 2016-16 [Member]
Income tax (benefit) expense			$ 8,000,000
Adjustments | Accounting Standards Update 2016-09 [Member]
Accumulated deficit						8,900,000
Adjustments | Accounting Standards Update 2016-16 [Member]
Accumulated deficit						2,000,000
Increase in non-current deferred tax assets						4,500,000
Decrease in other current prepaid asset						$ (2,500,000)
Scenario Forecast | Minimum
Cumulative effect adjustment				$ 1,000
Scenario Forecast | Maximum
Cumulative effect adjustment				$ 10,000,000

[1] Cumulative adjustment related to the adoption of accounting standards, see Note 3 Impact of Recently Adopted Accounting Standards of Notes to the Consolidated Financial Statements for additional information.