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Medical Equipment and Property - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | |||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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| Property, Plant and Equipment [Line Items] | |||||
| Depreciation expense for medical equipment recorded in cost of revenues - pump depreciation and disposals | $ 1,300,000 | $ 1,300,000 | $ 2,400,000 | $ 2,600,000 | |
| Depreciation expense for property and equipment recorded in general and administrative expenses | 100,000 | 100,000 | 200,000 | 300,000 | |
| Medical equipment held for sale or rental | 3,155,000 | 3,155,000 | 2,626,000 | ||
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Pre-Owned Equipment [Member]
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| Property, Plant and Equipment [Line Items] | |||||
| Medical equipment held for sale or rental | $ 500,000 | $ 500,000 | |||