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Stock-Based Compensation - Narrative (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 31, 2011
Nov. 30, 2014
Nov. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Approved and authorized maximum number of shares to be issued       3,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized    
Compensation expense related to stock based awards outstanding $ 1,600,000us-gaap_AllocatedShareBasedCompensationExpense $ 2,100,000us-gaap_AllocatedShareBasedCompensationExpense $ 3,100,000us-gaap_AllocatedShareBasedCompensationExpense      
Granted (in shares) 233,828us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 35,081us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 262,051us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross      
Proceeds received upon exercise of stock options 869,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 858,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 298,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions      
Exercise of stock options, shares 143,282us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 155,731us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 56,658us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised      
Total share-based compensation cost not yet recognized 2,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized          
Share-based compensation cost not yet recognized, period for recognition 2 years 4 months 24 days          
Total intrinsic value of options exercised 494,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 804,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 130,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue      
Total fair value of shares vested 923,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 1,457,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 1,997,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1      
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options, expiration period       10 years    
Forfeiture rate applied to options 5.50%orn_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsForfeitureRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Stock options | Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of equity compensation grants awarded $ 70,000orn_CompensationArrangementWithIndividualFairValueOfSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
         
Grants awarded during period         6,167orn_CompensationArrangementWithIndividualSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
6,206orn_CompensationArrangementWithIndividualSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
Weighted average grant-date fair value of options granted           $ 11.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
Granted (in shares)         233,828us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
 
Stock options | Officers and Executives            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Grants awarded during period         84,891orn_CompensationArrangementWithIndividualSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= orn_OfficersandExecutivesMember
 
Weighted average grant-date fair value of options granted         11.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= orn_OfficersandExecutivesMember
 
Stock options | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options, vesting period       3 years    
Stock options | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options, vesting period       5 years    
Restricted stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Granted (in dollars per share) $ 11.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 11.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 6.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember