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Restructuring and Excess Facilities Restructuring and Excess Facilities - 2016 Restructuring Roll Forward (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Adjustments to restructuring provisions		$ 5,307	$ 14,602	$ 1,372
Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			19,779
Adjustments to restructuring provisions		4,123	247
Reclassification of deferred rent			1,087
Cash payments		(11,065)	(7,507)
Foreign exchange loss		952	(62)
Restructuring reserve		7,554	13,544
Less: current portion (4)		(3,831)
Long-term portion (4)		3,723
Facility Closing [Member] | Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	[1]		1,655
Adjustments to restructuring provisions	[1]	1,223	582
Reclassification of deferred rent	[1]		1,087
Cash payments	[1]	(1,172)	(948)
Foreign exchange loss	[1]		(1)
Restructuring reserve	[1]	2,426	2,375
Less: current portion (4)	[1]	(645)
Long-term portion (4)	[1]	1,781
TVN Voluntary Departure Plan [Member] | Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			13,175
Adjustments to restructuring provisions		1,766	0
Reclassification of deferred rent			0
Cash payments		(7,203)	(3,484)
Foreign exchange loss		915	(41)
Restructuring reserve	[1]	5,128	9,650
Less: current portion (4)		(3,186)
Long-term portion (4)		1,942
Employee Severance [Member] | Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			4,702
Adjustments to restructuring provisions		1,134	(88)
Reclassification of deferred rent			0
Cash payments		(2,690)	(3,075)
Foreign exchange loss		37	(20)
Restructuring reserve		0	1,519
Less: current portion (4)		0
Long-term portion (4)		$ 0
Other Restructuring [Member] | Harmonic 2016 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			247
Adjustments to restructuring provisions			$ (247)
[1] The current portion and long-term portion of the restructuring liability are reported under “Accrued and other current liabilities” and “Other non-current liabilities”, respectively, on the Company’s Consolidated Balance Sheets.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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