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Quarterly Financial Information (Unaudited) (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 1,564,115 $ 1,519,767 $ 1,470,121 $ 1,444,542 $ 1,417,135 $ 1,396,810 $ 1,384,977 $ 1,363,218 $ 5,998,545 $ 5,562,140 $ 5,071,654
Gross profit 733,380 751,788 730,777 708,260 691,499 692,471 686,798 681,188      
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
Earnings per share attributable to Equinix:                      
Basic (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 (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