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Prepayment on Property, Plant and Equipment - Additional Information (Detail) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Line Items] |  |
Prepayments to Property Plant Equipment |  | $ 7,241,472

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- Details
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Namespace Prefix: | onp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Sum of the carrying amounts as of the balance sheet date of amounts paid in advance for expenses which will be charged against earnings in periods after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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