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Segment Reporting and Foreign Operations - Long-lived Assets by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-Lived Assets | $ 244,171 us-gaap_NoncurrentAssets | $ 243,270 us-gaap_NoncurrentAssets | $ 234,803 us-gaap_NoncurrentAssets
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-Lived Assets | 177,627 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 178,130 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 176,644 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Ireland |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-Lived Assets | 49,708 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE | 50,274 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE | 48,182 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_IE
Other Foreign Countries |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-Lived Assets | $ 16,836 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mmsi_OtherForeignCountriesMember | $ 14,866 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mmsi_OtherForeignCountriesMember | $ 9,977 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = mmsi_OtherForeignCountriesMember

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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