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Long-term incentive compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |  | 9 Months Ended
--- | --- | ---
Nov. 04, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Long-term incentive program (LTIP) expense |  | $ 82,469 | $ 74,077
Stock-based compensation expense |  | 47,811 | 59,605
Estimated tax benefits recorded for stock-based compensation |  | 6,798 | 10,887
Unrecognized compensation cost related to outstanding LTIP awards |  | 166,502 |
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans |  | $ 151,805 |
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under performance-based cash component of LTIP costs, weighted average remaining period (in years) |  | 7 months 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 7 months 6 days |
Share-based Payment Arrangement, Expense, Tax Benefit |  | $ 2,791 | 7,919
Restricted and Performance Stock Units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-settled awards granted (in shares) |  | 1,921 |
Aggregate grant-date fair value |  | $ 96,472 |
Weighted-average expected life (in years) |  | 3 years 4 months 24 days |
Stock Appreciation Rights |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-settled awards granted (in shares) |  | 2,390 |
Aggregate grant-date fair value |  | $ 33,545 |
Weighted-average expected life (in years) |  | 4 years |
General and Administrative Expense |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense |  | $ 43,666 | $ 60,461
Subsequent Event | Premium Priced Stock-Settled Stock Appreciation Rights |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-settled awards granted (in shares) | 2,500 |  |
Premium Priced Award Base Price Per Share | $ 67.80 |  |
Premium To The Tender Offer Share Purchase Price | 20.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 5 years |  |
Subsequent Event | Vesting period, tranche one | Premium Priced Stock-Settled Stock Appreciation Rights |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 50.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |
Subsequent Event | Vesting period, tranche two | Premium Priced Stock-Settled Stock Appreciation Rights |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 50.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years |  |

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