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Segment Reporting (Changes in Goodwill by Reportable Segment) (Detail) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 5,510,851 | $ 5,031,685
Goodwill acquired | 63,651 | 223,028
Goodwill divested |  | (845)
Impact of changes in foreign currency | (39,935) | 43,688
Goodwill, Ending Balance | 5,534,567 | 5,297,556
Eastern [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 1,331,180 | 1,126,486
Goodwill acquired | 6,228 | 22,146
Goodwill, Ending Balance | 1,337,408 | 1,148,632
Southern [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 1,528,225 | 1,517,610
Goodwill acquired | 3,648 | 10,329
Goodwill divested |  | (845)
Goodwill, Ending Balance | 1,531,873 | 1,527,094
Western [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 400,037 | 398,174
Goodwill acquired | 43,151 | 1,334
Goodwill, Ending Balance | 443,188 | 399,508
Central [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 729,470 | 540,435
Goodwill acquired | 10,450 | 189,194
Goodwill, Ending Balance | 739,920 | 729,629
Canada [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 1,521,939 | 1,448,980
Goodwill acquired | 174 | 25
Impact of changes in foreign currency | (39,935) | 43,688
Goodwill, Ending Balance | $ 1,482,178 | $ 1,492,693

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