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Long-term incentive compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	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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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.

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Amount of Long-term Incentive Program compensation cost.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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