Goodwill (Details) - USD ($) $ in Thousands |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Goodwill [Roll Forward] | |||||
| Beginning balance, as restated | [1] | $ 195,373 | $ 171,740 | ||
| Goodwill acquired during the period | 31,419 | 23,437 | [1] | ||
| Goodwill adjustments for purchase price allocation of business acquired | 14 | 376 | [1] | ||
| Goodwill written-off - closed clinics | 0 | (180) | [1] | ||
| Ending balance | $ 226,806 | $ 195,373 | [1] | ||
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