Balance Sheet Components - Components of Content Assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Content assets, net	$ 18,396,359	$ 14,681,989
Current content assets, net	4,987,916	4,310,934
Non-current content assets, net	$ 13,408,443	10,371,055
Average produced content asset amortization percentage	90.00%
Average produced content asset amortization period	4 years
Average unamortized cost percentage	30.00%
Average amortization period of unamortized cost at balance sheet date	1 year
Finite lived intangible assets amortization period tranche one	1 year
Finite lived intangible assets amortization period tranche two	3 years
Licensed content, net
Finite-Lived Intangible Assets [Line Items]
Net content	$ 13,458,275	11,771,778
Produced content, net
Finite-Lived Intangible Assets [Line Items]
Net content	1,946,994	1,427,256
In production	2,757,434	1,311,137
In development and pre-production	222,885	158,517
Content assets, net	$ 4,927,313	2,896,910
Produced content amortization percentage over one year	32.00%
Produced content amortization percent over three years	82.00%
DVD, net
Finite-Lived Intangible Assets [Line Items]
Content assets, net	$ 10,771	$ 13,301