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Share-based compensation (Narrative) (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | May 14, 2014 shares
Share-Based Compensation [Line Items] |  |  |  |  |
Share based compensation expense | $ |  | $ 107,719 | $ 102,843 | $ 100,162 |
Equity Incentive Plan 2012 |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Equity awards available for grants (in shares) |  |  |  |  | 8,064,081
Equity Incentive Plan 2014 |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Equity awards available for grants (in shares) |  |  |  |  | 4,500,000
NV Equity Plan |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Restricted stock units convertible to common shares, conversion ratio | 1 |  |  |  |
NV Equity Plan | Time Based and Performance Based Restricted Stock Units And Restricted Stocks [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Overlap of equity awards vested and expected to vest included in shares outstanding (in shares) |  | 6,500,000 |  |  |
NV Equity Plan | Minimum [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Equity award vesting period |  | 3 years |  |  |
NV Equity Plan | Maximum [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Equity award vesting period |  | 5 years |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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