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Concentration of Major Suppliers - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 Vendor | Jun. 30, 2011 Vendor | Jun. 30, 2012 Vendor | Jun. 30, 2011 Vendor
Concentration Risk [Line Items] |  |  |  |
Number of major suppliers | 2 | 2 | 2 | 2
Supplier A |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of total purchase from major suppliers | 79.00% | 74.00% | 76.00% | 77.00%
Supplier B |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Percentage of total purchase from major suppliers | 6.00% | 16.00% | 10.00% | 12.00%

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

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- 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