Name:	orn_EarlyRepaymentOfLongTermDebt
Namespace Prefix:	orn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The annual percentage rent increase per terms of the failed sale leaseback arrangement.

No definition available.

Name:	orn_FailedSaleLeasebackArrangementAnnualRentIncreasePercent
Namespace Prefix:	orn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The yearly payments due under a failed sale leaseback arrangement entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

No definition available.

Name:	orn_FailedSaleLeasebackArrangementAnnualRentalPayments
Namespace Prefix:	orn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Term of failed sale leaseback arrangement.

No definition available.

Name:	orn_FailedSaleLeasebackArrangementLeaseTermOfContract
Namespace Prefix:	orn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Term of available options under failed sale leaseback arrangement.

No definition available.

Name:	orn_FailedSaleLeasebackArrangementLeaseTermOfOptions
Namespace Prefix:	orn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The number of consecutive options to extend the term available under a failed sale leaseback arrangement.

No definition available.

Name:	orn_FailedSaleLeasebackArrangementNumberOfExtensionOptions
Namespace Prefix:	orn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Amount of cash inflow before closing and debt issuance costs received by a seller-lessee in a failed sale-leaseback recognized in financing activities.

No definition available.

Name:	orn_FailedSaleLeasebackTransactionGrossProceedsFinancingActivities
Namespace Prefix:	orn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.