XML 38 R44.htm IDEA: XBRL DOCUMENT v2.4.1.9
Leases - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating and Capital Leases [Line Items]      
Operating Leases, Rent Expense, Sublease Rentals $ 3,800,000us-gaap_OperatingLeasesRentExpenseSubleaseRentals1    
Equipment Expense 1,200,000us-gaap_EquipmentExpense 1,400,000us-gaap_EquipmentExpense 1,800,000us-gaap_EquipmentExpense
Lease Expiration Year 2016    
Discontinued Operations      
Operating and Capital Leases [Line Items]      
Accrued Rent, Current 4,400,000us-gaap_AccruedRentCurrent
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		 1,100,000us-gaap_AccruedRentCurrent
/ us-gaap_StatementOperatingActivitiesSegmentAxis
= us-gaap_SegmentDiscontinuedOperationsMember		  
Minimum      
Operating and Capital Leases [Line Items]      
Control Centers Leases Range Price 1,500med_ControlCentersLeasesRangePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Control Centers Leases Term 5 years    
Maximum      
Operating and Capital Leases [Line Items]      
Control Centers Leases Range Price $ 5,000med_ControlCentersLeasesRangePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Control Centers Leases Term 10 years