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

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 25

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

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