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Subsequent Events - Additional Information (Detail)
May 01, 2017
USD ($)
data_center_building
Apr. 26, 2017
$ / shares
Feb. 15, 2017
$ / shares
Dec. 06, 2016
data_center
Subsequent Event [Line Items]        
Quarterly cash dividend declared (in dollars per share)     $ 2.00  
Subsequent event [Member]        
Subsequent Event [Line Items]        
Quarterly cash dividend declared (in dollars per share)   $ 2.00    
Verizon        
Subsequent Event [Line Items]        
Data center buildings | data_center       29
Verizon | Subsequent event [Member]        
Subsequent Event [Line Items]        
Data center buildings | data_center_building 29      
Cash consideration for acquisition | $ $ 3,600,000,000