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Earnings Per Share - Additional Information (Detail)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Antidilutive securities excluded from earnings per share computation, shares 3.3us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 3.0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Antidilutive securities excluded from diluted weighted average shares computation, shares 40.9mdr_AntidilutiveSecuritiesExcludedFromComputationOfDilutedEarningsPerShare