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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 263 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2002 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2002 | Dec. 31, 2012 | Dec. 12, 2001
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Maturity period of cash equivalents |  | 90 days or less at the time of purchase |  |  |  |  |
Percentage of credit exchange receivable |  | 65.00% |  |  |  |  |
Reduction in headcount for AlleCure and CTL | 50.00% |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 151,400,000
Goodwill impairment |  |  |  |  | 151,400,000 | 151,428,000 |
Interest expense, net of interest capitalized |  | 21,600,000 | 21,800,000 | 17,400,000 |  |  |
Interest cost capitalized |  | $ 300,000 | $ 400,000 |  |  |  |

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