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Fair Value Measurements (Narrative) (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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Proceeds from sale of other investments                 $ 236,618 $ 135,571 $ 0
Income tax expense $ (33,654) $ 24,376 $ (621) $ 68,388 $ 36,833 $ (73,802) $ 11,477 $ (96,325) 58,489 (121,817) (308,279)
Reduction of "Other comprehensive income (loss)"                 $ (3,317) 83,752 (2,045)
Other than temporary impairment of cost investments                     $ 2,000
Reclassification out of Accumulated Other Comprehensive Income [Member]                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Realized gain on sale of marketable securities                   130,900  
Income tax expense                   48,600  
Reduction of "Other comprehensive income (loss)"                   $ 82,300