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Long-term incentive compensation - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands | 6 Months Ended
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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

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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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