XML 20 R46.htm IDEA: XBRL DOCUMENT v2.4.0.6
Property and Equipment (Narrative) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Line Items]      
Property and equipment includes medical and other equipment held under capital leases $ 133,789,000 $ 125,721,000  
Accumulated depreciation of property and equipment held under capital leases 74,051,000 65,191,000  
Recorded depreciation expense 15,800,000 15,000,000 13,500,000
Medical And Other Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Property and equipment includes medical and other equipment held under capital leases 1,400,000 1,600,000  
Accumulated depreciation of property and equipment held under capital leases $ 1,100,000 $ 1,100,000