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Segment Reporting (Reconciliation of Primary Measure of Segment Profitability to Income Before Income Tax Provision) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment EBITDA | $ 424,727 | [1] | $ 439,463 | [1] | $ 1,213,569 | $ 1,231,980
Depreciation | (157,590) |  | (157,994) |  | (459,641) | (461,616)
Amortization of intangibles | (32,653) |  | (31,934) |  | (96,062) | (93,821)
Impairments and other operating items | (3,805) |  | (12,935) |  | (442,582) | (32,949)
Interest expense | (40,636) |  | (36,780) |  | (119,562) | (111,313)
Interest income | 903 |  | 2,056 |  | 4,396 | 7,186
Other income (expense), net | 702 |  | (19) |  | (3,046) | 4,562
Income before income tax provision | 191,648 |  | 201,857 |  | 97,072 | 544,029
Eastern [Member] |  |  |  |  |  |
Segment EBITDA | 90,991 | [1] | 88,101 | [1] | 258,333 | 250,106
Southern [Member] |  |  |  |  |  |
Segment EBITDA | 81,394 | [1] | 113,209 | [1] | 276,844 | 327,139
Western [Member] |  |  |  |  |  |
Segment EBITDA | 101,071 | [1] | 90,059 | [1] | 267,523 | 253,504
Central [Member] |  |  |  |  |  |
Segment EBITDA | 82,887 | [1] | 81,746 | [1] | 235,742 | 219,280
Canada [Member] |  |  |  |  |  |
Segment EBITDA | 72,516 | [1] | 66,794 | [1] | 185,589 | 193,702
Corporate [Member] |  |  |  |  |  |
Segment EBITDA | (4,132) | [1],[2] | (446) | [1],[2] | (10,462) | (11,751)
Reportable Segments [Member] |  |  |  |  |  |
Segment EBITDA | $ 428,859 |  | $ 439,909 |  | $ 1,224,031 | $ 1,243,731
[1] | For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in the Company’s most recent Annual Report on Form 10-K.
[2] | Corporate consists of expenses associated with its administrative departments and certain centralized expenses including cash and equity-based incentive compensation, direct acquisition expenses and share-based compensation expenses associated with Progressive Waste share-based grants outstanding at June 1, 2016 that were continued by the Company. Amounts reflected are net of allocations to the five operating segments.

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