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Summary of Significant Accounting Policies (Narrative) (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
item
Nov. 30, 2014
USD ($)
item
Dec. 31, 2018
USD ($)
item
entity
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
Summary of Significant Accounting Policies [Line Items]          
Cost-method investments, impairment loss     $ 0 $ 0 $ 0
Proceeds from sale of other investments     150,900,000 200,000  
Gain on sale of investments     0 0  
Cost-method investments, carrying value $ 8,600,000   14,600,000 8,600,000  
Interest cost capitalized     900,000 1,100,000 1,000,000
Deferred lease costs 11,000,000   11,300,000 11,000,000 10,200,000
Amortization expense 13,100,000   12,200,000 13,100,000 11,300,000
Unamortized deferred lease costs 27,700,000   $ 27,000,000 27,700,000  
Intangible assets, useful life     15 years    
Impairment charge recognized, related to long-lived assets     $ 27,100,000 36,700,000 $ 30,200,000
Accounts receivable, net 90,673,000   111,035,000 90,673,000  
Asset retirement obligation 7,200,000   $ 9,900,000 $ 7,200,000  
Number of wholly owned subsidiaries that entered into intercompany loan agreement | entity     2    
Intercompany loan maximum lend/borrow amount $ 500,000,000 $ 750,000,000      
Number of towers acquired | item 941 1,641 1,316 1,425 531
Gain (loss) on remeasurement of U.S. dollar denominated intercompany loan     $ (89,101,000) $ (8,754,000) $ 90,030,000
Intercompany foreign currency outstanding balance $ 560,900,000   $ 536,900,000 560,900,000  
Oi S.A. [Member]          
Summary of Significant Accounting Policies [Line Items]          
Percentage reduction in accounts receivable due to customer reorganization plan     10.00%    
Number of annual installment payments | item     4    
Minimum [Member] | Accounting Standards Update 2016-02 [Member]          
Summary of Significant Accounting Policies [Line Items]          
Lease liability     $ 2,300,000,000    
Maximum [Member] | Accounting Standards Update 2016-02 [Member]          
Summary of Significant Accounting Policies [Line Items]          
Lease liability     2,700,000,000    
Site Development [Member]          
Summary of Significant Accounting Policies [Line Items]          
Accounts receivable, net $ 20,800,000   $ 27,100,000 $ 20,800,000  
Site Development [Member] | Revenue [Member]          
Summary of Significant Accounting Policies [Line Items]          
Concentration risk percentage     7.00%