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Other Contingencies - Additional Information (Detail) (USD $) | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2011 | Sep. 30, 2012 State
Other Contingencies [Line Items] |  |
Bank line of credit |  | $ 57,000,000
Borrowings under line of credit |  | 0
Irrevocable standby letter of credit, outstanding |  | $ 40,420,000
Line of credit expiration date |  | Jun. 30, 2013
Number of states in which entity operates |  | 48
Percent reduction of Medicare payments to nursing centers | 11.10% |

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