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Property, Plant and Equipment - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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| Property, Plant and Equipment [Line Items] | ||||
| Interest cost paid | $ 300,000 | $ 200,000 | $ 600,000 | $ 400,000 |
| Interest cost capitalized | 100,000 | 18,000 | 400,000 | 35,000 |
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Property, Plant and Equipment [Member]
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| Property, Plant and Equipment [Line Items] | ||||
| Depreciation | $ 1,300,000 | $ 900,000 | $ 2,600,000 | $ 1,800,000 |