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Long-term incentive compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 23, 2020 $ / shares | Nov. 04, 2019 shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Jun. 11, 2020 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Long-term incentive program (LTIP) expense | $ |  |  |  | $ 74,492 | $ 82,469 |
Stock-based compensation expense | $ |  |  |  | 67,217 | 47,811 |
Estimated tax benefits recorded for stock-based compensation | $ |  |  |  | 8,794 | 6,798 |
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans | $ |  |  | $ 207,513 | $ 207,513 |  |
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 |  |
Longterm Incentive Compensation cash awards, number of awards outstanding |  |  |  | 0 |  |
Compensation cost related to LTIP awards | $ |  |  |  | $ 66,302 |  |
Share-based Payment Arrangement, Expense, Tax Benefit | $ |  |  |  | $ 5,049 | 2,791 |
Restricted and Performance Stock Units |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  |  |  | 991,000 |  |
Aggregate grant-date fair value | $ |  |  |  | $ 75,945 |  |
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] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures |  |  |  | 2,765,000 |  |
Aggregate grant-date fair value | $ |  |  |  | $ 73,833 |  |
Weighted-average expected life (in years) |  |  |  | 4 years 9 months 18 days |  |
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, Options, Grants in Period, Net of Forfeitures |  | 2,500,000 |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Options, Grant Date | Jan. 23, 2020 |  |  |  |  |
Premium Priced Award Base Price Per Share | $ / shares | $ 67.80 |  |  |  |  |
Premium To The Tender Offer Share Purchase Price | 20.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date | Nov. 04, 2024 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Holding Period, End Date | Nov. 04, 2024 |  |  |  |  |
Premium Priced Stock-Settled Stock Appreciation Rights | Vesting period, tranche one |  |  |  |  |  |
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 Date | Nov. 04, 2023 |  |  |  |  |
Premium Priced Stock-Settled Stock Appreciation Rights | Vesting period, tranche two |  |  |  |  |  |
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 Date | Nov. 04, 2022 |  |  |  |  |
General and Administrative Expense |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  | $ 67,217 | $ 43,666 |
The2020 Incentive Award Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 8,730,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 5,000,000
The 2011 Incentive Award Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  | 3,730,000
Stockbased Compensation Number Of Shares Available For Issuance Reduced By One Share Available For Every Four Shares Underlying SARS And Stock Options |  |  | 1 |  |  |
Stockbased Compensation Number Of Shares Underlying SARS And Stock Options, Per Share of One Full Share Available For Issuance |  |  | 4 |  |  |
Stockbased Compensation Number Of Shares Available For Issuance Reduced By One Share Available For Every One Share Underlying Other Full Share Type Of Award |  |  | 1 |  |  |
Stock-based Compensation Number Of Shares Underlying Full Share Types Of Stock-based Awards, Per Share of One Full Share Available For Issuance |  |  | 1 |  |  |
Maximum | The2020 Incentive Award Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Period |  |  | 10 years |  |  |

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