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Segment Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Segment Divisions | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Number of internal divisions | Divisions |  |  | 2 |  |
Revenues | $ 2,609,307 | $ 2,042,186 | $ 6,987,851 | $ 5,548,353 |
Property and equipment | 1,256,458 |  | 1,256,458 |  | $ 1,174,094
Foreign Operations |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 653,100 | $ 459,600 | 1,830,000 | $ 1,150,000 |
Property and equipment | $ 334,000 |  | $ 334,000 |  | $ 320,700
Foreign Operations | Canada |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of foreign revenues | 80.00% | 78.00% | 81.00% | 75.00% |

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