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Acquisitions (Narrative) (Detail)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Jun. 02, 2016
USD ($)
shares
Jan. 31, 2017
territory
customer
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
May 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
entity
Sep. 30, 2016
USD ($)
entity
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 01, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]                        
Cash consideration, net of cash acquired               $ 394,002 $ 13,703      
Stockholders equity stock conversion ratio       1.5                
Number of individual businesses acquired that are not specifically described | entity               11        
Impairments and other operating items       $ 832 $ 7,682     $ 141,333 4,634      
Change in liability-classified contingent consideration               17,754 (2,563)      
Revenues       1,206,478 1,084,922     3,473,313 2,327,241      
Income before income tax provision       187,800 131,366     362,511 248,368      
Goodwill expected to be deductible for tax purposes       51,518       51,518   $ 51,518    
Goodwill acquired               309,031 2,931,223      
Trade receivables acquired in business combination gross contractual amount       20,025       20,025   20,025    
Trade receivables acquired in business combination expected to be uncollectible amount       $ 713       $ 713   $ 713    
Fair value of acquired working capital is provisional | entity               10        
Groot Industries, Inc. [Member]                        
Business Acquisition [Line Items]                        
Revenues                     $ 200,000  
Progressive Waste Solutions Ltd. [Member]                        
Business Acquisition [Line Items]                        
Contingent consideration payable period                   1 year    
Issuance of common shares to acquire Progressive Waste, shares | shares 78,218,878                      
Closing price per share | $ / shares                       $ 44.79
Fair value discount rate     2.00%                  
Stockholders equity stock conversion ratio 3.1152645                      
Acquisition-related costs               $ 758 31,588      
Contingent payable fair value                       $ 10,452
Impairments and other operating items             $ 57,362          
Change in liability-classified contingent consideration               9,631        
Revenues           $ 687,108 826,886          
Income before income tax provision           68,289 $ 79,470          
Goodwill expected to be deductible for tax purposes     $ 303,594                  
Goodwill acquired               3,023,585        
Trade receivables acquired in business combination gross contractual amount     239,212                  
Trade receivables acquired in business combination expected to be uncollectible amount     $ 7,503                  
Progressive Waste Solutions Ltd. [Member] | Credit Agreement [Member]                        
Business Acquisition [Line Items]                        
Liabilities incurred $ 1,659,465                      
Progressive Waste Solutions Ltd. [Member] | Maximum [Member]                        
Business Acquisition [Line Items]                        
Contingent payable fair value                       $ 5,000
Progressive Waste Solutions Ltd. [Member] | Waste Connections, Inc. [Member]                        
Business Acquisition [Line Items]                        
Stockholders equity stock conversion ratio 3.1152645                      
Percentage of combined company owned     70.00%                  
Progressive Waste Solutions Ltd. [Member] | Progressive Waste [Member]                        
Business Acquisition [Line Items]                        
Percentage of combined company owned     30.00%                  
Groot Industries, Inc. [Member]                        
Business Acquisition [Line Items]                        
Number of customers served by company acquired | customer   300,000                    
Number of collection operations acquired | territory   7                    
Number of transfer stations acquired | territory   6                    
Number of recycling facilities acquired | territory   1                    
Individually Immaterial Non-Hazardous Solid Waste Collection Businesses [Member]                        
Business Acquisition [Line Items]                        
Acquisition-related costs               3,660        
Other Acquisition [Member]                        
Business Acquisition [Line Items]                        
Acquisition-related costs                 $ 773      
Number of immaterial businesses acquired in period | entity                 10      
Goodwill expected to be deductible for tax purposes         4,716 4,716     $ 4,716      
Goodwill acquired                 4,716      
Trade receivables acquired in business combination gross contractual amount         947 947     947      
Trade receivables acquired in business combination expected to be uncollectible amount         $ 426 $ 426     $ 426      
Tax-exempt Bonds [Member] | Progressive Waste Solutions Ltd. [Member]                        
Business Acquisition [Line Items]                        
Liabilities incurred $ 64,000                      
Other Long-term Liabilities [Member} | Progressive Waste Solutions Ltd. [Member]                        
Business Acquisition [Line Items]                        
Liabilities incurred 5,809                      
Debt [Member]                        
Business Acquisition [Line Items]                        
Liabilities incurred               56,958        
Debt [Member] | Progressive Waste Solutions Ltd. [Member]                        
Business Acquisition [Line Items]                        
Liabilities incurred $ 1,729,274             $ 1,729,274