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Income taxes - Deferred Tax Liabilities and Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Deferred tax liabilities |  |  |  |
Accelerated depreciation | $ 62,951 | $ 43,396 |  |
Accelerated amortization of deductible intangibles | 524,697 | 427,760 |  |
Right-of-use assets for operating leases | 25,615 |  |  |
Other | 3,677 | 2,655 |  |
Total deferred tax liabilities | 616,940 | 473,811 |  |
Deferred tax assets |  |  |  |
Accrued compensation costs | 16,180 | 13,440 |  |
Pension and post-retirement medical and life | 35,192 | 34,679 |  |
Loss carryforwards | 38,686 | 120,695 |  |
Operating lease liabilities | 26,008 |  |  |
Other | 30,914 | 34,044 |  |
Total deferred tax assets | 146,980 | 202,858 |  |
Deferred tax asset valuation allowance | 45,661 | 125,894 | $ 136,418 | $ 209,939
Total net deferred tax (liabilities) | $ (515,621) | $ (396,847) |  |

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