v3.8.0.1

Summary of significant accounting policies - Non controlling interests (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-controlling interests
Distributions to non-controlling interest holders	$ 125	$ 286	$ 500
Chicago Concourse Development Group, LLC
Non-controlling interests
Percentage of net profits less capital expenditures of the preceding year allocated to non-controlling interest holders	30.00%
Distributions to non-controlling interest holders	$ 125	286	500
Boingo Holding Participacoes Ltda.
Non-controlling interests
Distributions to non-controlling interest holders	$ 0	$ 0	$ 0

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.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

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- Definition

Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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