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Income Taxes (Significant Components of Deferred Income Tax Assets and Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred income tax assets:    
Accrued expenses $ 31,840 $ 26,600
Compensation 22,545 18,150
Contingent liabilities 21,268 17,652
Tax credits and loss carryforwards 24,415 24,044
Interest rate and fuel hedges 13,536 25,093
Finance costs 24,264  
Other   872
Gross deferred income tax assets 137,868 112,411
Less: Valuation allowance
Total deferred income tax assets 137,868 112,411
Deferred income tax liabilities:    
Goodwill and other intangibles (397,855) (332,097)
Property and equipment (484,519) (440,019)
Landfill closure/post-closure (18,597) (13,846)
Prepaid expenses (11,534) (14,990)
Investment in subsidiaries (69,286) (69,391)
Finance costs   (2,112)
Other (6,998)  
Total deferred income tax liabilities (988,789) (872,455)
Net deferred income tax liability $ (850,921) $ (760,044)