v3.8.0.1

Summary of significant accounting policies - Terms of contracts (Details) | 3 Months Ended
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Mar. 31, 2018
DAS license agreements | Minimum |
Revenue recognition |
Initial term of the arrangement | 5 years
DAS license agreements | Maximum |
Revenue recognition |
Initial term of the arrangement | 20 years
Wholesale-Wi-Fi | Minimum |
Revenue recognition |
Initial term of the arrangement | 1 year
Wholesale-Wi-Fi | Maximum |
Revenue recognition |
Initial term of the arrangement | 3 years

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Represents the term of the arrangement that is used as a basis for recognizing certain revenues. + References No definition available. + Details
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Namespace Prefix: | wifi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |