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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)