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Segment Information - Financial Information by Segment (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
segment
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]      
Number of reportable segments 2us-gaap_NumberOfReportableSegments    
Net revenue $ 9,440,182us-gaap_SalesRevenueNet $ 9,071,532us-gaap_SalesRevenueNet $ 8,868,324us-gaap_SalesRevenueNet
Operating earnings 159,536us-gaap_OperatingIncomeLoss 198,083us-gaap_OperatingIncomeLoss 196,753us-gaap_OperatingIncomeLoss
Acquisition-related and exit and realignment charges (42,801)omi_AcquisitionRelatedAndExitAndRealignmentCharges (12,444)omi_AcquisitionRelatedAndExitAndRealignmentCharges (10,164)omi_AcquisitionRelatedAndExitAndRealignmentCharges
Fair value adjustments related to purchase accounting 3,706omi_BusinessAcquisitionFairValueAdjustments 0omi_BusinessAcquisitionFairValueAdjustments 0omi_BusinessAcquisitionFairValueAdjustments
Other (1) (3,907)us-gaap_OtherNonrecurringIncomeExpense 0us-gaap_OtherNonrecurringIncomeExpense 0us-gaap_OtherNonrecurringIncomeExpense
Depreciation and amortization 57,423omi_DepreciationDepletionandAmortizationContinuingOperations 50,586omi_DepreciationDepletionandAmortizationContinuingOperations 39,604omi_DepreciationDepletionandAmortizationContinuingOperations
Capital expenditures 70,808us-gaap_PaymentsToAcquireProductiveAssets 60,129us-gaap_PaymentsToAcquireProductiveAssets 38,963us-gaap_PaymentsToAcquireProductiveAssets
Domestic Segment      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net revenue 8,951,852us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
8,688,018us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
8,731,484us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
Operating earnings 209,277us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
211,932us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
212,335us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
Depreciation and amortization 37,193omi_DepreciationDepletionandAmortizationContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
35,808omi_DepreciationDepletionandAmortizationContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
35,016omi_DepreciationDepletionandAmortizationContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
Capital expenditures 52,529us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
42,802us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
34,450us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= omi_DomesticMember
International Segment      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net revenue 488,330us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
383,514us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
136,840us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
Operating earnings (6,739)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
(1,405)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
(5,418)us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
Depreciation and amortization 20,230omi_DepreciationDepletionandAmortizationContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
14,778omi_DepreciationDepletionandAmortizationContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
4,588omi_DepreciationDepletionandAmortizationContinuingOperations
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
Capital expenditures $ 18,279us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
$ 17,327us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember
$ 4,513us-gaap_PaymentsToAcquireProductiveAssets
/ us-gaap_StatementBusinessSegmentsAxis
= omi_InternationalMember