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Investments (Schedule Of Investment In Nonconsolidated affiliates) (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investment, beginning balance       $ 27,740,000       $ 248,530,000 $ 27,740,000 $ 248,530,000  
Cash advances (repayments)                 2,578,000 5,263,000  
Acquisitions of investments, net                 65,526,000 8,520,000  
Equity in earnings (loss) $ 314,000 $ (857,000) $ (690,000) 331,000 $ (29,000) $ 3,955,000 $ (16,000) (13,326,000) (902,000) (9,416,000) $ (77,696,000)
Foreign currency transaction adjustment                 (307,000)    
Foreign currency translation adjustment                   1,215,000  
Distributions received                 (1,350,000) (1,242,000)  
Proceeds on sale                   (236,603,000)  
Loss on investments                 (5,000,000)    
Other                 553,000 11,473,000  
Investment, ending balance 88,838,000       27,740,000       88,838,000 27,740,000 248,530,000
Costmethod Investments [Member]                      
Investment, beginning balance       16,269,000       7,783,000 16,269,000 7,783,000  
Cash advances (repayments)                 0 0  
Acquisitions of investments, net                 47,546,000 8,520,000  
Equity in earnings (loss)                 0 0  
Foreign currency transaction adjustment                 (13,000)    
Foreign currency translation adjustment                   (20,000)  
Distributions received                 0 (14,000)  
Proceeds on sale                   0  
Loss on investments                 (5,000,000)    
Other                 0 0  
Investment, ending balance 58,802,000       16,269,000       58,802,000 16,269,000 7,783,000
Marketable Equity Securities [Member]                      
Investment, beginning balance       1,978,000       1,942,000 1,978,000 1,942,000  
Cash advances (repayments)                 0 0  
Acquisitions of investments, net                 0 0  
Equity in earnings (loss)                 0 0  
Foreign currency transaction adjustment                 (205,000)    
Foreign currency translation adjustment                   (291,000)  
Distributions received                 0 0  
Proceeds on sale                   0  
Loss on investments                 0    
Other                 553,000 327,000  
Investment, ending balance 2,326,000       1,978,000       2,326,000 1,978,000 1,942,000
ARN [Member]                      
Investment, beginning balance       0       220,750,000 0 220,750,000  
Cash advances (repayments)                 0 0  
Acquisitions of investments, net                   0  
Equity in earnings (loss)                 0 (12,678,000)  
Foreign currency transaction adjustment                 0    
Foreign currency translation adjustment                   1,449,000  
Distributions received                 0 (228,000)  
Proceeds on sale                 0 (220,783,000)  
Other                 0 11,490,000  
Investment, ending balance 0       0       0 0 220,750,000
All Others [Member]                      
Investment, beginning balance       $ 9,493,000       $ 18,055,000 9,493,000 18,055,000  
Cash advances (repayments)                 2,578,000 5,263,000  
Acquisitions of investments, net                 17,980,000 0  
Equity in earnings (loss)                 (902,000) 3,262,000  
Foreign currency transaction adjustment                 (89,000)    
Foreign currency translation adjustment                   77,000  
Distributions received                 (1,350,000) (1,000,000)  
Proceeds on sale                 0 (15,820,000)  
Other                 0 (344,000)  
Investment, ending balance $ 27,710,000       $ 9,493,000       $ 27,710,000 $ 9,493,000 $ 18,055,000