Balance Sheet Components - Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Leases [Abstract]
Cash paid for operating lease liabilities	$ 79,472	$ 59,473	$ 161,911	$ 116,963
Right-of-use assets obtained in exchange for new operating lease obligations	183,351	$ 364,606	232,796	$ 416,430
Operating lease right-of-use assets, net	2,102,676		2,102,676		$ 2,037,726
Current operating lease liabilities	275,040		275,040		256,222
Non-current operating lease liabilities	2,042,067		2,042,067		1,945,631
Total operating lease liabilities	$ 2,317,107		$ 2,317,107		$ 2,201,853
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other non-current assets		Other non-current assets		Other non-current assets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	us-gaap:AccruedLiabilitiesCurrent		us-gaap:AccruedLiabilitiesCurrent		us-gaap:AccruedLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other non-current liabilities		Other non-current liabilities		Other non-current liabilities