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Segment Information - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Segment | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Property and equipment | $ 1,129,597 |  | $ 1,129,597 |  | $ 1,099,574
Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Percentage of foreign revenues | 84.00% | 75.00% | 86.00% | 80.00% |
Foreign Operations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 359,200 | $ 392,200 | $ 892,700 | $ 848,400 |
Property and equipment | $ 357,500 |  | $ 357,500 |  | $ 372,900

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