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Segment Information - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) Segment | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Revenues | $ 1,792,430 | $ 1,872,340 | $ 3,506,167 | $ 3,733,726 |
Property and equipment | 1,160,870 |  | 1,160,870 |  | $ 1,101,959
Foreign Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 335,600 | $ 359,200 | 688,000 | $ 892,700 |
Property and equipment | $ 334,100 |  | $ 334,100 |  | $ 317,600
Foreign Operations [Member] | Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of foreign revenues | 67.00% | 84.00% | 73.00% | 86.00% |

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