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Acquisitions (Narrative) (Details) | 9 Months Ended |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 USD ($) | Sep. 29, 2014 BRL | Sep. 30, 2014 Other Acquisitions [Member] item | Sep. 30, 2014 Subsequent Event [Member] USD ($) item
Business Acquisition [Line Items] |  |  |  |
Number of towers acquired |  |  | 94 | 52
Number of towers, acquired right to use |  |  | 4 |
Cash paid for acquisition |  |  |  | $ 40,600,000
Foreign currency forward contracts |  | 1,170,000,000 |  |
Foreign currency floor price |  | 2.4 |  |
Foreign currency ceiling price |  | 2.5665 |  |
Gain (loss) on derivative | $ 0 |  |  |

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