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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 |  |  |  |  |

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