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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 1 Months Ended
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Jun. 30, 2013 Practice_Groups | Jul. 26, 2013 Subsequent Event [Member] Medical Management Professionals Business [Member]
Summary Of Significant Accounting Policies [Line Items] |  |
Aggregate Purchase price consideration paid during transaction |  | $ 200
Proceeds after payment of Divestiture Of Operation |  | $ 145
Number of practice groups | 3 |

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- Definition Disposal group business transferred amount under contractual arrangement. + References No definition available. + Details
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Balance Type: | credit
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- Definition Number of practice groups. + References No definition available. + Details
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- Details
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- Definition The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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