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Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
plan
country
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
plan
country
Jun. 30, 2020
USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance $ 10,576,675 $ 10,634,118 $ 8,669,294 $ 8,840,382 $ 10,634,118 $ 8,840,382
Net Change 67,745 (95,481) 66,380 (272,067) (27,736) (205,687)
Ending balance $ 10,646,472 10,576,675 10,388,258 8,669,294 $ 10,646,472 10,388,258
Number of defined benefit pension plans | plan 2       2  
Number of countries with a defined benefit pension plan | country 2       2  
Accumulated other comprehensive loss attributable to Equinix            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance $ (1,008,848) (913,368) (1,206,669) (934,613) $ (913,368) (934,613)
Net Change 67,734 (95,480) 66,378 (272,056) (27,746)  
Ending balance (941,114) (1,008,848) $ (1,140,291) $ (1,206,669) (941,114) $ (1,140,291)
Foreign currency translation adjustment (“CTA”) loss            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance   (508,415)     (508,415)  
Net Change         (184,690)  
Ending balance (693,105)       (693,105)  
Unrealized gain (loss) on cash flow hedges            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance   (67,152)     (67,152)  
Net Change         23,778  
Ending balance (43,374)       (43,374)  
Net investment hedge CTA gain (loss)            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance   (336,934)     (336,934)  
Net Change         133,139  
Ending balance (203,795)       (203,795)  
Net actuarial gain (loss) on defined benefit plans            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance   $ (867)     (867)  
Net Change         27  
Ending balance $ (840)       $ (840)