CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Class A ordinary shares/ Common stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury shares [Member]	Accumulated other comprehensive income (loss) [Member]
Balance at Dec. 31, 2011	$ 4,325,987	$ 15,947	$ 1,478,233	$ 3,186,362	$ (128,884)	$ (225,671)
Balance (in shares) at Dec. 31, 2011		123,581
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares issued (acquired) under share-based compensation plans	(3,815)	64	(21,362)	0	17,483	0
Net shares issued (acquired) under share-based compensation plans (in shares)		553
Share-based compensation	18,252	0	18,252	0	0	0
Excess tax benefit from share-based compensation plans	1,153	0	1,153	0	0	0
Retirement benefit adjustments, net of taxes	10,203	0	0	0	0	10,203
Cancelation of treasury shares	0	(419)	(109,068)	0	109,487	0
Other	0	0	0	0	0	0
Other (in shares)		52
Net income	126,531	0	0	126,531	0	0
Balance at Sep. 30, 2012	4,478,311	15,592	1,367,208	3,312,893	(1,914)	(215,468)
Balance (in shares) at Sep. 30, 2012		124,186
Balance at Dec. 31, 2012	4,531,724	15,593	1,372,135	3,366,964	(1,886)	(221,082)
Balance (in shares) at Dec. 31, 2012		124,211
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares issued (acquired) under share-based compensation plans	(1,718)	4	2,331	0	(4,053)	0
Net shares issued (acquired) under share-based compensation plans (in shares)		26
Share-based compensation	20,918	0	20,918	0	0	0
Excess tax benefit from share-based compensation plans	977	0	977	0	0	0
Retirement benefit adjustments, net of taxes	10,986	0	0	0	0	10,986
Other	1,820	0	1,820	0	0	0
Net income	202,878	0	0	202,878	0	0
Balance at Sep. 30, 2013	$ 4,767,585	$ 15,597	$ 1,398,181	$ 3,569,842	$ (5,939)	$ (210,096)
Balance (in shares) at Sep. 30, 2013		124,237