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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 275 Months Ended
Dec. 31, 2002
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2002
Dec. 31, 2013
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   21,500,000 21,600,000 21,800,000      
Interest cost capitalized   $ 400,000 $ 300,000 $ 400,000