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Contingencies - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 17, 2012 | Dec. 31, 2012 | Dec. 31, 2010
Operating and Capital Leases [Line Items] |  |  |
Payments to civil penalty | $ 3,700,000 |  |
Litigation settlement expense |  |  | 6,500
Compensatory and punitive damages |  | $ 270,000,000 |
Number Of Corporate Operated Centers |  | 87 |

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