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Certain Relationships And Related Party Transactions (Narrative) (Detail) - USD ($)
 12 Months Ended
Jan. 07, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Aug. 09, 2010
Related Party Transaction [Line Items]            
Management agreement maturity date   2018        
Management fee, rate per year   $ 15,000,000        
Management fees and reimbursable expenses   15,200,000 $ 15,800,000 $ 15,900,000    
Common Class A [Member]            
Related Party Transaction [Line Items]            
Total authorized stock repurchase amount   $ 34,200,000       $ 100,000,000
Common Class A [Member] | CC Finco, LLC [Member]            
Related Party Transaction [Line Items]            
Shares purchase amout during the period   5,000,000   111,291 1,553,971  
Shares purchased during the period, value   $ 48,800,000   $ 692,887 $ 16,400,000  
Subsequent Event | Common Class A [Member] | CC Finco, LLC [Member]            
Related Party Transaction [Line Items]            
Shares purchased during the period, value $ 20,400,000          
Additional shares purchased 2,000,000