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Description of Business - Additional Information (Detail)
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12 Months Ended |
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Dec. 31, 2014
Center
Hospital
Physician
Facility
State
|
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| Schedule Of Description Of Business [Line Items] | |
| Conversion rate units into stock/options | 10.25 |
| Number of states in which business operates | 34 |
| Number of Ambulatory Surgery Center Facilities | 179 |
| Number of surgical hospitals | 6 |
| Description of sleep center operations | one sleep center with 11 locations |
| Number of physician partners | 2,000 |
| Total facilities | 186 |
| Options Held [Member] | |
| Schedule Of Description Of Business [Line Items] | |
| Conversion rate units into stock/options | 10.25 |