Fair Value Measurements (Narrative) (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value Measurements [Abstract]
Notional amount	$ 2,500,000,000								$ 2,500,000,000
Interest Rate Swap Maturity Date	September 30, 2013								September 30, 2013
Other than temporary impairment of cost investments										2,000,000
Other than temporary impairment for equity method investments										2,600,000	4,800,000
Interest rate swap fair value	0				76,939,000				0	76,939,000
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	36,833,000	(73,802,000)	11,477,000	(96,325,000)	(128,986,000)	(13,232,000)	(8,663,000)	(157,398,000)	(121,817,000)	(308,279,000)	(125,978,000)
Reduction of "Other comprehensive income (loss)"									(83,752,000)	2,045,000	5,148,000
Proceeds from sale of other investments									135,571,000	0	6,894,000
Gain (loss) on marketable securities	(50,000)	31,000	130,898,000	0	(4,580,000)	0	0	0	130,879,000	(4,580,000)	(4,827,000)
Reclassification Adjustment Out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized gain on sale of marketable securities									130,900,000
Income tax expense									48,600,000
Reduction of "Other comprehensive income (loss)"									82,300,000
Proceeds from sale of other investments									$ 135,500,000