Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 27

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 20

-Article 7

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

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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

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: 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=31042434&loc=d3e3291-108585

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Summary of significant accounting policies (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009
Non-controlling interests
Non-controlling owners capital account amount	1,028us-gaap_MinorityInterest	$ 865us-gaap_MinorityInterest
Distributions to non-controlling interest holders	623us-gaap_PaymentsToMinorityShareholders	608us-gaap_PaymentsToMinorityShareholders	678us-gaap_PaymentsToMinorityShareholders
Concourse Communications Detroit, LLC
Non-controlling interests
Initial term of Detroit Operating Agreement	7 years
Optional extension period of Detroit Operating Agreement	4 years
Non-controlling owners capital account amount				0
Distributions to non-controlling interest holders		48	121
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	623	560	557
Boingo Holding Participacoes Ltda
Non-controlling interests
Distributions to non-controlling interest holders	0	$ 0