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Fair Value Measurement - Liabilities Measured at Fair Value on Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
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Mar. 31, 2015
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Accrued contingent consideration for practice acquisitions (included in payable for practice acquisitions) |
$ 56,308 |
| Quoted Price In Active Markets for Identical Instruments (Level 1) [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Accrued contingent consideration for practice acquisitions (included in payable for practice acquisitions) |
0 |
| Significant Other Observable Inputs (Level 2) [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
| Accrued contingent consideration for practice acquisitions (included in payable for practice acquisitions) |
0 |
| Significant Unobservable Inputs (Level 3) [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
| Accrued contingent consideration for practice acquisitions (included in payable for practice acquisitions) |
$ 56,308 |