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Property and Equipment - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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|
| Property, Plant and Equipment [Line Items] | |||
| Medical and other equipment held under capital leases | $ 162,943,000 | $ 146,910,000 | |
| Accumulated depreciation of property and equipment held under capital leases | 96,895,000 | 86,999,000 | |
| Recorded depreciation expense | 15,900,000 | 15,500,000 | 15,800,000 |
| Medical and Other Equipment [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Medical and other equipment held under capital leases | 2,400,000 | 1,400,000 | |
| Accumulated depreciation of property and equipment held under capital leases | $ 1,400,000 | $ 1,200,000 | |