XML 29 R49.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Financial Instruments - Schedule of Gross Amounts and Offsetting Amounts of Reverse Repurchase Agreements, Repurchase Agreements, Securities Borrowed and Securities Lending Transactions (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | $ 2,867,976 | $ 1,525,881
Gross Amounts Offset in the Statement of Financial Position | 2,568,939 | 1,160,239
Net Amounts of Assets Presented on the Balance Sheet | 299,037 | 365,642
Financial Instruments | (299,037) | (365,642)
Cash Collateral Received |  |
Net Amount |  |
Gross Amounts of Recognized Liabilities | 3,451,543 | 1,743,017
Gross Amounts Offset in the Statement of Financial Position | 2,568,939 | 1,160,239
Net Amounts of Liabilities Presented on the Balance Sheet | 882,604 | 582,778
Financial Instruments | (882,604) | (582,778)
Cash Collateral Pledged |  |
Net Amount |  |
Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 3,199,792 | 1,552,630
Gross Amounts Offset in the Statement of Financial Position | 2,568,939 | 1,160,239
Net Amounts of Liabilities Presented on the Balance Sheet | 630,853 | 392,391
Financial Instruments | (630,853) | (392,391)
Cash Collateral Pledged |  |
Net Amount |  |
Securities Loaned [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 251,751 | 190,387
Net Amounts of Liabilities Presented on the Balance Sheet | 251,751 | 190,387
Financial Instruments | (251,751) | (190,387)
Cash Collateral Pledged |  |
Net Amount |  |
Reverse Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 2,568,939 | 1,160,239
Gross Amounts Offset in the Statement of Financial Position | 2,568,939 | 1,160,239
Cash Collateral Received |  |
Net Amount |  |
Securities Borrowed [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 299,037 | 365,642
Net Amounts of Assets Presented on the Balance Sheet | 299,037 | 365,642
Financial Instruments | (299,037) | (365,642)
Cash Collateral Received |  |
Net Amount |  |

X
- Definition Cash collateral pledged not offset gross . + References No definition available. + Details
Name: | opy_CashCollateralPledgedNotOffsetGross
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash collateral received not offset gross. + References No definition available. + Details
Name: | opy_CashCollateralReceivedNotOffsetGross
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financial instruments assets not offset gross. + References No definition available. + Details
Name: | opy_FinancialInstrumentsAssetsNotOffsetGross
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financial instruments liabilities not offset gross. + References No definition available. + Details
Name: | opy_FinancialInstrumentsLiabilitiesNotOffsetGross
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gross amounts offset in statement of financial assets. + References No definition available. + Details
Name: | opy_GrossAmountsOffsetInStatementOfFinancialAssets
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross amounts offset in statement of financial liabilities. + References No definition available. + Details
Name: | opy_GrossAmountsOffsetInStatementOfFinancialLiabilities
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gross amounts of recognized assets. + References No definition available. + Details
Name: | opy_GrossAmountsOfRecognizedAssets
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross amounts of recognized liabilities. + References No definition available. + Details
Name: | opy_GrossAmountsOfRecognizedLiabilities
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net amounts of assets presented in balance sheet. + References No definition available. + Details
Name: | opy_NetAmountsOfAssetsPresentedInBalanceSheet
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net amounts of liabilities presented in balance sheet. + References No definition available. + Details
Name: | opy_NetAmountsOfLiabilitiesPresentedInBalanceSheet
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Net assets amount not offset in balance sheet. + References No definition available. + Details
Name: | opy_NetAssetsAmountNotOffsetInBalanceSheet
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net liabilities amount not offset in balance sheet. + References No definition available. + Details
Name: | opy_NetLiabilitiesAmountNotOffsetInBalanceSheet
Namespace Prefix: | opy_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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