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Subsequent Events (Detail) - Subsequent event [Member]
$ / shares in Units, $ in Millions
3 Months Ended
Oct. 30, 2019
$ / shares
Oct. 08, 2019
Mar. 31, 2020
USD ($)
data_center
Subsequent Event [Line Items]      
Cash dividends declared (in dollars per share) | $ / shares $ 2.46    
Joint Venture [Member] | Equinix, Inc. [Member]      
Subsequent Event [Line Items]      
Ownership interest   20.00%  
Joint Venture [Member] | GIC, Singapore Sovereign Wealth Fund [Member]      
Subsequent Event [Line Items]      
Ownership interest   80.00%  
Data centers in Mexico [Member] | Forecast [Member]      
Subsequent Event [Line Items]      
Data center sites | data_center     3
Cash consideration for acquisition | $     $ 175.0