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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]                      
Net income                 $ 370,074 $ 507,245 $ 365,359
Net (income) loss attributable to non-controlling interests                 (297) 205 0
Net income attributable to Equinix $ 50,994 $ 66,687 $ 133,304 $ 118,792 $ 124,995 $ 120,850 $ 143,527 $ 118,078 $ 369,777 $ 507,450 $ 365,359
Weighted-average shares used to calculate basic EPS (in shares)                 87,700 84,140 79,779
Effect of dilutive securities:                      
Employee equity awards (in shares)                 710 539 418
Weighted-average shares used to calculate diluted EPS (in shares)                 88,410 84,679 80,197
Basic EPS (in dollars per share) $ 0.57 $ 0.75 $ 1.53 $ 1.39 $ 1.47 $ 1.42 $ 1.70 $ 1.44 $ 4.22 $ 6.03 $ 4.58
Diluted EPS (in dollars per share) $ 0.57 $ 0.74 $ 1.52 $ 1.38 $ 1.46 $ 1.41 $ 1.69 $ 1.44 $ 4.18 $ 5.99 $ 4.56