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Investments (Schedule Of Investment In Nonconsolidated affiliates) (Detail) - Entity [Domain] - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investment, beginning balance       $ 238,805       $ 370,912 $ 238,805 $ 370,912  
Cash advances (repayments)                 3,452 3,051  
Acquisitions of investments, net                 1,811 1,354  
Equity in earnings (loss) $ (29) $ 3,955 $ (16) (13,326) $ (91,291) $ 3,983 $ 5,971 3,641 (9,416) (77,696) $ 18,557
Foreign currency transaction adjustment                 1,526 (37,064)  
Distributions received                 (1,228) (21,676)  
Proceeds on sale                 (236,603)    
Other                 11,146 (76)  
Investment, ending balance 9,493       238,805       9,493 238,805 370,912
ARN [Member]                      
Investment, beginning balance       220,750       353,062 220,750 353,062  
Cash advances (repayments)                 0 0  
Acquisitions of investments, net                 0 0  
Equity in earnings (loss)                 (12,678) (75,318)  
Foreign currency transaction adjustment                 1,449 (37,068)  
Distributions received                 (228) (19,926)  
Proceeds on sale                 (220,783)    
Other                 11,490 0  
Investment, ending balance 0       220,750       0 220,750 353,062
All Others [Member]                      
Investment, beginning balance       $ 18,055       $ 17,850 18,055 17,850  
Cash advances (repayments)                 3,452 3,051  
Acquisitions of investments, net                 1,811 1,354  
Equity in earnings (loss)                 3,262 (2,378)  
Foreign currency transaction adjustment                 77 4  
Distributions received                 (1,000) (1,750)  
Proceeds on sale                 (15,820)    
Other                 (344) (76)  
Investment, ending balance $ 9,493       $ 18,055       $ 9,493 $ 18,055 $ 17,850