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Stockholders' Equity - Components of Accumulated Other Comprehensive Loss (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
plan
country
Mar. 31, 2020
USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 10,634,118 $ 8,840,382
Net Change (95,481) (272,067)
Ending balance $ 10,576,675 8,669,294
Number of defined benefit pension plans | plan 2  
Number of countries with a defined benefit pension plan | country 2  
Accumulated other comprehensive loss attributable to Equinix    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ (913,368) (934,613)
Net Change (95,480) (272,056)
Ending balance (1,008,848) $ (1,206,669)
Foreign currency translation adjustment (“CTA”) loss    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (508,415)  
Net Change (295,145)  
Ending balance (803,560)  
Unrealized gain (loss) on cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (67,152)  
Net Change 29,478  
Ending balance (37,674)  
Net investment hedge CTA gain (loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (336,934)  
Net Change 170,175  
Ending balance (166,759)  
Net actuarial gain (loss) on defined benefit plans    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (867)  
Net Change 12  
Ending balance $ (855)