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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2014
Summary Of Significant Accounting Policies [Line Items] |  |
Balance in excess of FDIC-insured limits |  | $ 64,000,000
Chemical [Member] | Scenario Adjustment [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Additional repairs and maintenance expenses classified as cost of sales | 405,000 |
Repair part average cost |  | 100
Additional obsolescence expenses classified as cost of sales | $ 324,000 | $ 324,000
Effect of adjustment in basic and diluted net loss per share | $ 0.02 |
Effect of adjustment in basic and diluted net income per share |  | $ 0.01
Minimum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Ownership interest in equity method investment | 20.00% | 20.00%
Maximum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Ownership interest in equity method investment | 50.00% | 50.00%
Short-Term Investments [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Original maturity period |  | 26 weeks
Noncurrent Restricted Investments [Member] | CD [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Original maturity period |  | No longer than approximately 26 weeks

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- Definition The balance of an asset deposited or invested that are in excess of the FDIC-insured limit. + References No definition available. + Details
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Balance Type: | debit
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- Definition Certificate Of Deposit Original Maturity Period + References No definition available. + Details
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- Definition The effect of an adjustment which decreases net income per basic and diluted share. + References No definition available. + Details
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- Definition The effect of an adjustment which increases net loss per basic and diluted share. + References No definition available. + Details
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- Definition The average cost per unit for repair parts. + References No definition available. + Details
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- Details
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- Definition The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28360613&loc=d3e4542-108314 + Details
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