Long-term incentive compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Long-term incentive program (LTIP) expense	$ 59,481	$ 61,042
Stock-based compensation expense	28,478	29,817
Estimated tax benefits recorded for stock-based compensation	9,474	9,769
Unrecognized compensation cost related to outstanding LTIP awards	144,184
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans	$ 82,765
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under performance-based cash component of LTIP costs, weighted average remaining period (in years)	1 year 1 month 18 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
Tax benefits from stock award exercises	$ 6,046	$ 27,012
Stock Appreciation Rights
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock granted (in shares)	1,672
Aggregate grant-date fair value	$ 24,246
Weighted-average expected life (in years)	4 years 2 months 28 days
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock granted (in shares)	526
Aggregate grant-date fair value	$ 34,540
Weighted-average expected life (in years)	3 years 4 months 15 days
Cash Settled Stock Based Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock granted (in shares)	15
Aggregate grant-date fair value	$ 204
Weighted-average expected life (in years)	4 years 3 months 18 days

Employee service share-based compensation estimated tax benefit from compensation expense.

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- Definition

Unrecognized cost of LTIP awards granted.

+ References

No definition available.

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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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- Definition

Share-based compensation arrangement by share-based payment award, grant date fair value of options granted.

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No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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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.

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- Definition

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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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.

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Net number of share options (or share units) granted during the period.

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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