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Long-term incentive compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Long-term incentive program (LTIP) expense | $ 74,077 | $ 46,972
Stock-based compensation expense | 59,605 | 28,478
Estimated tax benefits recorded for stock-based compensation | 10,887 | 8,497
Stock-based Compensation, Modification charge | 14,680 |
Stock-based Compensation, Net acceleration of expense | 8,790 |
Unrecognized compensation cost related to outstanding LTIP awards | 122,887 |
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans | $ 103,923 |
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under performance-based cash component of LTIP costs, weighted average remaining period (in years) | 10 months 24 days |
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under stock-based component of LTIP costs, weighted average remaining period (in years) | 1 year 6 months |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense | $ 7,919 | 6,046
Stock Appreciation Rights |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock granted (in shares) | 1,897 |
Aggregate grant-date fair value | $ 30,817 |
Weighted-average expected life (in years) | 4 years 2 months 12 days |
Restricted Stock Units |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock granted (in shares) | 1,097 |
Aggregate grant-date fair value | $ 72,718 |
Weighted-average expected life (in years) | 3 years 3 months 18 days |
General and Administrative Expense |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Stock-based compensation expense | $ 60,461 | $ 25,281

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- Definition Unrecognized cost of LTIP awards granted. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for the long-term incentive program, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of Long-term Incentive Program compensation cost. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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