CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (USD $) In Thousands	Class A ordinary shares/ Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury shares [Member]	Accumulated other comprehensive income (loss) [Member]	Total
Balance at Dec. 31, 2010	$ 15,794	$ 1,433,999	$ 2,449,521	$ (1,509)	$ (145,495)	$ 3,752,310
Balance (in shares) at Dec. 31, 2010	126,294
Shares issued under share-based compensation plans	150	14,957	0	(1,604)	0	13,503
Shares issued under share-based compensation plans (in shares)	1,178
Shares reacquired	0	0	0	(80,924)	0	(80,924)
Shares reacquired (in shares)	(2,508)
Share-based compensation	0	16,766	0	0	0	16,766
Excess tax benefit from share-based compensation plans	0	5,128	0	0	0	5,128
Net income	0	0	691,740	0	0	691,740
Balance at Sep. 30, 2011	15,944	1,470,850	3,141,261	(84,037)	(145,495)	4,398,523
Balance (in shares) at Sep. 30, 2011	124,964
Balance at Dec. 31, 2011	15,947	1,478,233	3,186,362	(128,884)	(225,671)	4,325,987
Balance (in shares) at Dec. 31, 2011	123,581
Shares issued under share-based compensation plans	64	(21,362)	0	17,483	0	(3,815)
Shares issued under share-based compensation plans (in shares)	553
Share-based compensation	0	18,252	0	0	0	18,252
Excess tax benefit from share-based compensation plans	0	1,153	0	0	0	1,153
Retirement benefit adjustments, net of taxes of $5,494	0	0	0	0	10,203	10,203
Cancelation of treasury shares	(419)	(109,068)	0	109,487	0	0
Other	0	0	0	0	0	0
Other (in shares)	52
Net income	0	0	126,531	0	0	126,351
Balance at Sep. 30, 2012	$ 15,592	$ 1,367,208	$ 3,312,893	$ (1,914)	$ (215,468)	$ 4,478,311
Balance (in shares) at Sep. 30, 2012	124,186