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Business Combinations - Additional Information (Details) (USD $) | 12 Months Ended | 0 Months Ended | 4 Months Ended | 0 Months Ended | 7 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 22, 2014 | Dec. 31, 2014 | May 21, 2012 | Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Purchase price of acquisition | $ 20,723,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 156,312,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |
Goodwill | 122,720,000 us-gaap_Goodwill | 111,343,000 us-gaap_Goodwill | 111,407,000 us-gaap_Goodwill |  | 122,720,000 us-gaap_Goodwill |  | 111,407,000 us-gaap_Goodwill
Surgichem [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  | 20,700,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember |  |  |
Cash acquired from Acquisition |  |  |  | 200,000 us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember |  |  |
Intangible assets acquired |  |  |  | 5,730,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember |  |  |
Goodwill |  |  |  | 12,112,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember |  |  |
Acquisition generated revenue |  |  |  |  | 4,600,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember |  |
Income (Loss) from operations |  |  |  |  | (100,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember |  |
Total revenue | 13,300,000 omcl_BusinessCombinationProFormaInformationRevenueofAcquireeCurrentFiscalPeriod / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember | 11,900,000 omcl_BusinessCombinationProFormaInformationRevenueofAcquireeCurrentFiscalPeriod / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember |  |  |  |  |
Acquisition deferred tax liabilities |  |  |  | 1,104,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember |  |  |
Surgichem [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 5,400,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Acquired intangible assets, useful life (in years) |  |  |  | 18 years |  |  |
Surgichem [Member] | Trade Names [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 300,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  |  |
Acquired intangible assets, useful life (in years) |  |  |  | 1 year |  |  |
MedPak Holdings, Inc. [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Purchase price of acquisition |  |  |  |  |  | 156,300,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member |
Cash acquired from Acquisition |  |  |  |  |  | 2,000,000 us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member |
Intangible assets acquired |  |  |  |  |  | 83,900,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member |
Goodwill |  |  |  |  |  | 82,800,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member |
Acquisition generated revenue |  |  |  |  |  |  | 47,200,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member
Income (Loss) from operations |  |  |  |  |  |  | 2,900,000 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member
Acquisition deferred tax liabilities |  |  |  |  |  | 33,386,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member |
MedPak Holdings, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | 50,500,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
MedPak Holdings, Inc. [Member] | Trade Names [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  |  | 6,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Acquired intangible assets, useful life (in years) |  |  |  |  |  | 12 years |
Minimum [Member] | MedPak Holdings, Inc. [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Acquired intangible assets, useful life (in years) |  |  |  |  |  | 12 years |
Minimum [Member] | MedPak Holdings, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Acquired intangible assets, useful life (in years) |  |  |  |  |  | 28 years |
Maximum [Member] | MedPak Holdings, Inc. [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Acquired intangible assets, useful life (in years) |  |  |  |  |  | 30 years |
Maximum [Member] | MedPak Holdings, Inc. [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Acquired intangible assets, useful life (in years) |  |  |  |  |  | 30 years |
Selling, General and Administrative Expenses [Member] | Surgichem [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs | 1,100,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  |  |  |  |  |
Acquisition expense reimbursement | (500,000)omcl_BusinessCombinationAdditionalDisclosuresAcquisitionCostsReimbursed / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  |  |  | (500,000)omcl_BusinessCombinationAdditionalDisclosuresAcquisitionCostsReimbursed / us-gaap_BusinessAcquisitionAxis = omcl_SurgichemMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  |
Selling, General and Administrative Expenses [Member] | MedPak Holdings, Inc. [Member] |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  | $ 3,200,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = omcl_MedPakHoldingsInc.Member / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  |  |  |  |

X
- Definition Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Costs Reimbursed, Recognized in the Income Statement Selling, General, and Administrative Expense + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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