Long-term incentive compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Long-term incentive program (LTIP) expense	$ 41,054	$ 31,301
Stock-based compensation expense	29,045	19,861
Estimated tax benefits recorded for stock-based compensation	3,835	3,941
Unrecognized compensation cost related to outstanding LTIP awards	169,602
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans	$ 155,951
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under performance-based cash component of LTIP costs, weighted average remaining period (in years)	9 months 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 8 months 12 days
Share-based Payment Arrangement, Expense, Tax Benefit	$ 2,675	7,671
Stock Appreciation Rights
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock granted (in shares)	2,343
Aggregate grant-date fair value	$ 32,870
Weighted-average expected life (in years)	4 years
Restricted and Performance Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock granted (in shares)	1,885
Aggregate grant-date fair value	$ 94,414
Weighted-average expected life (in years)	3 years 4 months 24 days
General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 24,900	$ 20,717

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

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Unrecognized cost of LTIP awards granted.

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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