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Concentrations of risk and geographic information - Schedule of Revenue by Geographic Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenue	$ 240,569	$ 400,340	$ 644,860	$ 1,183,368
United States [Member]
Segment Reporting Information [Line Items]
Revenue	122,500	169,200	310,700	513,600
Americas [Member]
Segment Reporting Information [Line Items]
Revenue	135,895	190,839	345,770	583,282
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Revenue	77,346	156,639	198,338	432,904
Asia and Pacific Area Countries [Member]
Segment Reporting Information [Line Items]
Revenue	$ 27,328	$ 52,862	$ 100,752	$ 167,182

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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- 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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