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Acquisitions (Narrative) (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) entity | Sep. 30, 2017 USD ($) entity | Sep. 30, 2018 USD ($) entity | Dec. 31, 2016 USD ($) customer | Jan. 31, 2017 territory
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition-related costs |  |  | $ 4,907 | $ 4,418 |  |  |
Number of individual businesses acquired that are not specifically described | entity |  |  |  | 11 |  |  |
Number of immaterial businesses acquired in period | entity |  |  | 15 |  |  |  |
Revenues | $ 1,281,110 | $ 1,206,478 | $ 3,661,209 | $ 3,473,313 |  |  |
Goodwill expected to be deductible for tax purposes | 169,559 | 51,518 | 169,559 | 51,518 | $ 169,559 |  |
Trade receivables acquired in business combination gross contractual amount | 14,015 | 20,025 | 14,015 | 20,025 | 14,015 |  |
Trade receivables acquired in business combination expected to be uncollectible amount | 1,198 | $ 713 | $ 1,198 | $ 713 | $ 1,198 |  |
Fair value of acquired working capital is provisional | entity |  |  |  |  | 5 |  |
Groot Industries, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenues |  |  |  |  |  | $ 200,000 |
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
One Acquisition [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration payable period |  |  | 3 years |  |  |  |
Fair value discount rate |  |  | 2.70% |  |  |  |
Contingent consideration | 11,593 |  | $ 11,593 |  | $ 11,593 |  |
One Acquisition [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration | $ 12,582 |  | $ 12,582 |  | $ 12,582 |  |

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