Quarterly report pursuant to Section 13 or 15(d)

Medical Equipment and Property - Additional Information (Detail)

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Medical Equipment and Property - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2014
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Property, Plant and Equipment [Line Items]              
Depreciation expense for medical equipment   $ 0.9   $ 1.3 $ 2.4 $ 3.8  
Estimated useful life of medical equipment     7 years       5 years
Change in estimated useful lives, decrease in depreciation   0.4     1.4    
Change in estimated useful lives, decrease in net income after tax   0.2     0.8    
Change in estimated useful lives, basic and diluted income per share         $ 0    
Depreciation expense for property and equipment (other than medial equipment) recorded in general and administrative expenses   0.1   0.1 0.2 0.2  
Payment for remaining equipment 0.5            
Pre-Owned Equipment [Member]
             
Property, Plant and Equipment [Line Items]              
Medical equipment held for sale or rental - financial institution             $ 0.8