Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Current tax benefit allocated directly to stockholder’s equity for compensation expense	$ 1,200,000	$ 12,300,000	$ 4,900,000
Valuation allowance for deferred tax assets	123,442,000	40,676,000
Available capital loss carryforwards	25,600,000
Undistributed earnings of foreign subsidiaries	105,600,000
Unrecognized tax benefits that would affect the effective tax rate	78,300,000	62,800,000	65,400,000
Interest benefit from accrued interest and penalties	100,000	500,000	2,800,000
Interest on income taxes accrued	11,500,000	$ 10,900,000	$ 10,200,000
N-Vision and TVN Entities [Member]
Income Taxes [Line Items]
Increase in valuation allowance	47,300,000
Net Operating Loss and Non-deductible Interest Expense Carryforwards [Member]
Income Taxes [Line Items]
Valuation allowance for deferred tax assets	109,200,000
Capital Loss [Member]
Income Taxes [Line Items]
Valuation allowance for deferred tax assets	9,300,000
Federal Tax Authority [Member]
Income Taxes [Line Items]
Net operating loss carry-forwards	$ 2,300,000
Operating loss carry forwards expiration dates	2032
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carry-forwards	$ 17,900,000
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Net operating loss carry-forwards	$ 736,400,000
Operating loss carry forwards expiration dates	2016
Minimum [Member]
Income Taxes [Line Items]
Decrease in gross unrecognized tax benefits balance	$ 0
Minimum [Member] | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carry forwards expiration dates	2028
Maximum [Member]
Income Taxes [Line Items]
Decrease in gross unrecognized tax benefits balance	$ 63,500,000
Maximum [Member] | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carry forwards expiration dates	2034