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Concentration of Major Suppliers (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Concentration Risk [Line Items] |  |  |  |
Number of major suppliers | 2 | 2 | 2 | 2
Supplier A [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of total purchase from major suppliers | 76.00% | 75.00% | 76.00% | 77.00%
Supplier B [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of total purchase from major suppliers | 8.00% | 5.00% | 7.00% | 10.00%

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- Definition Number of Suppliers + References No definition available. + Details
Name: | onp_NumberOfSuppliers
Namespace Prefix: | onp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of Purchases from Major Suppliers + References No definition available. + Details
Name: | onp_PercentageOfPurchasesFromMajorSuppliers
Namespace Prefix: | onp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration