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Geographic Information - Summary of Geographical Revenues and Assets (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Revenue | $ 71,519 | $ 57,257 | $ 186,075 | $ 159,806 | |
| Property, Plant and Equipment, net | 2,072,449 | 2,072,449 | 1,476,142 | ||
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Geographical Information [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Revenue | 71,519 | 57,257 | 186,075 | 159,806 | |
| Property, Plant and Equipment, net | 2,072,449 | 2,072,449 | 1,476,142 | ||
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Geographical Information [Member] | United States [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Revenue | 53,720 | 50,054 | 144,107 | 131,042 | |
| Property, Plant and Equipment, net | 1,489,030 | 1,489,030 | 1,210,319 | ||
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Geographical Information [Member] | Canada [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Revenue | 9,146 | 7,203 | 33,454 | 28,764 | |
| Property, Plant and Equipment, net | 245,996 | 245,996 | 265,823 | ||
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Geographical Information [Member] | Chile [Member]
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| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||
| Revenue | 8,653 | 8,514 | |||
| Property, Plant and Equipment, net | $ 337,423 | $ 337,423 | |||