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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, except Share data in Thousands, unless otherwise specified | 1 Months Ended | 2 Months Ended
--- | --- | ---
Jul. 26, 2013 | Jul. 16, 2013
Westbury [Member] |  |
Subsequent Event [Line Items] |  |
Percent of holding acquired under business purchase agreement | 50.00% |
Number of share acquired under business purchase agreement | 3,858 |
Share Price Per Share Under Business Purchase Agreement |  | $ 6.65
Number of days moving average share price calculation |  | 60 days
Option agreement date | Sep. 14, 2010 |
Purchase of common stock | $ 7.25 |
Common stock expiration date | Sep. 30, 2013 |
Medical Management Professionals Business [Member] |  |
Subsequent Event [Line Items] |  |
Proceeds of business | $ 145 |
Disposal group business transferred amount under contractual arrangement | $ 200 |

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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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