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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 618,489 $ 203,992 $ 566,681
Adjustments to reconcile net income to net cash provided by operating activities:      
Loss on disposal of assets and impairments 27,727 445,647 60,592
Depreciation 673,730 621,102 618,396
Amortization of intangibles 139,279 131,302 125,522
Loss on early extinguishment of debt 115,288    
Deferred income taxes, net of acquisitions 14,563 (50,487) 54,637
Current period provision for credit losses 9,719 15,509 11,973
Amortization of debt issuance costs 5,055 7,509 5,001
Share-based compensation 58,221 45,751 42,671
Interest accretion 15,970 17,205 16,426
Payment of contingent consideration recorded in earnings (520) (10,371)  
Adjustments to contingent consideration 2,954 18,418 1,498
Other (1,260) 2,426 (2,240)
Changes in operating assets and liabilities, net of effects from acquisitions:      
Accounts receivable, net (54,688) 31,332 (34,906)
Prepaid expenses and other current assets (8,229) (17,749) 9,135
Accounts payable 66,752 (148,362) 71,147
Deferred revenue 31,707 14,981 19,156
Accrued liabilities 3,853 88,612 (22,938)
Capping, closure and post-closure expenditures (21,040) (6,484) (5,062)
Other long-term liabilities 659 (1,812) 2,858
Net cash provided by operating activities 1,698,229 1,408,521 1,540,547
CASH FLOWS FROM INVESTING ACTIVITIES:      
Payments for acquisitions, net of cash acquired (960,449) (388,789) (736,610)
Capital expenditures for property and equipment (744,315) (597,053) (634,406)
Capital expenditure for undeveloped landfill property   (67,508) (31,683)
Investment in noncontrolling interest (25,000)   (25,000)
Proceeds from disposal of assets 42,768 19,084 3,566
Other (6,486) (11,777) (1,873)
Net cash used in investing activities (1,693,482) (1,046,043) (1,426,006)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from long-term debt 2,112,193 1,815,625 1,575,795
Principal payments on notes payable and long-term debt (1,893,100) (1,542,958) (1,470,711)
Premiums paid on early extinguishment of debt (110,617)    
Payment of contingent consideration recorded at acquisition date (12,934) (12,566) (3,200)
Change in book overdraft (367) 1,096 (2,564)
Payments for repurchase of common shares (338,993) (105,654)  
Payments for cash dividends (220,203) (199,883) (175,067)
Tax withholdings related to net share settlements of equity-based compensation (18,606) (23,446) (17,660)
Debt issuance costs (18,521) (11,117) (5,953)
Proceeds from issuance of shares under employee share purchase plan 1,222    
Proceeds from sale of common shares held in trust 430 679 4,036
Distributions to noncontrolling interests     (570)
Net cash used in financing activities (499,496) (78,224) (95,894)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (25) 6,914 608
Net increase (decrease) in cash, cash equivalents and restricted cash (494,774) 291,168 19,255
Cash, cash equivalents and restricted cash at beginning of year 714,389 423,221 403,966
Cash, cash equivalents and restricted cash at end of year 219,615 714,389 423,221
SUPPLEMENTARY DISCLOSURES OF CASH FLOW INFORMATION AND NON-CASH TRANSACTIONS:      
Cash paid for income taxes 146,198 104,618 81,049
Cash paid for interest 157,485 142,310 139,694
Changes in accrued capital expenditures for property and equipment 22,153 (10,940) (7,528)
In connection with its acquisitions, the Company assumed liabilities as follows:      
Fair value of assets acquired 1,230,396 514,234 913,793
Payments for acquisitions, net of cash acquired (960,449) (388,789) (736,610)
Change in open working capital settlements at year end   (1,505) (5,272)
Liabilities assumed and notes payable issued to sellers of businesses acquired $ 269,947 $ 123,940 $ 171,911