Long-term incentive compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Long-term incentive program (LTIP) expense	$ 15,215	$ 15,254
Stock-based compensation expense	9,685	9,601
Estimated tax benefits recorded for stock-based compensation	2,088	2,922
Unrecognized compensation cost related to outstanding LTIP awards	91,823
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans	$ 62,013
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 6 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 3 months 18 days
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 4,895	1,091
Stock Appreciation Rights
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock granted (in shares)	11
Aggregate grant-date fair value	$ 200
Weighted-average expected life (in years)	3 years 8 months 12 days
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock granted (in shares)	60
Aggregate grant-date fair value	$ 3,995
Weighted-average expected life (in years)	1 year
General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 9,155	$ 8,425

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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- 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.

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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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- Definition

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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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
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