Annual report pursuant to Section 13 and 15(d)

Medical Equipment - Additional Information (Detail)

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Medical Equipment - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Pump equipment $ 11.2 $ 6.9
Accumulated depreciation related to leased assets 2.4 1.3
Depreciation expense for medical equipment $ 4.8 $ 3.3