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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract] |
Summary of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill as of December 31, 2013 and 2012 consisted of the following (in thousands):
|  | Year Ended |
|  | December 31 |
|  | 2013 |  |  | 2012 |
Beginning balance |  | $ | 100,188 |  |  | $ | 92,750 |
Goodwill acquired during the year |  |  | 52,213 |  |  |  | 10,538 |
Goodwill allocated to specific assets for businesses acquired in 2011 |  |  | — |  |  |  | (3,300 | )
Goodwill allocated to specific assets for businesses acquired in 2012 |  |  | (2,340 | ) |  |  | — |
Goodwill adjustments for purchase price allocation of businesses acquired |  |  | (48 | ) |  |  | 200 |
Goodwill written off - sale of physician services business |  |  | (6,058 | ) |  |  | — |
Ending balance |  | $ | 143,955 |  |  | $ | 100,188 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 + Details
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