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Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Short-term inventories: |  |
Raw materials | $ 46,940 | $ 52,598
Work-in-process | 1,422 | 4,902
Finished goods | 13,369 | 49,351
Supplies | 2,337 | 3,541
Total short-term inventories | 64,068 | 110,392
Long-term inventories: |  |
Finished goods | 1,295 | 1,249
Total inventories | $ 65,363 | $ 111,641

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