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Segment Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) Segment division | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Number of internal divisions | division |  |  | 2 |  |
Revenues | $ 2,985,281 | $ 2,609,307 | $ 8,059,205 | $ 6,987,851 |
Property and equipment | 1,350,894 |  | 1,350,894 |  | $ 1,288,602
Canada |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 522,618 |  | 1,376,149 |  |
Foreign Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 667,600 | $ 653,100 | 1,840,000 | $ 1,830,000 |
Property and equipment | $ 321,600 |  | $ 321,600 |  | $ 330,400
Foreign Operations | Canada |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of foreign revenues | 78.00% | 80.00% | 75.00% | 81.00% |

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