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Contingent Liabilities - Additional Information (Detail) (USD $) | Dec. 31, 2012
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Site Contingency [Line Items] |
Accrued environmental remediation expense | $ 400,000
Environmental Remediation Expense |
Site Contingency [Line Items] |
Accrued environmental remediation expense | $ 105,000

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- Definition Carrying amount of the liability for remediation of environmental damage pertaining to assets or businesses previously disposed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=6572457&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 4 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Period Type: | duration