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Commitments and Contingencies - Additional Information (Detail) (USD $) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Loss Contingencies [Line Items] |  |
Potential revision on future environmental remediation costs before tax | $ 17,000,000 |
Estimated site remediation liabilities | 13,045,000 | 16,599,000
Bergheim, Germany Site |  |
Loss Contingencies [Line Items] |  |
Estimated site remediation liabilities | 6,400,000 |
Pledged land and housing facilities | $ 6,100,000 |

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