CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	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, 2014	$ 4,691,399	$ 15,604	$ 1,436,910	$ 3,466,993	$ (7,990)	$ (220,118)
Balance (in shares) at Dec. 31, 2014		124,564
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares issued (acquired) under share-based compensation plans	(3,326)	$ 137	0		(3,463)
Net shares issued (acquired) under share-based compensation plans (in shares)		199
Share-based compensation	5,761		5,761
Excess tax benefit (shortfall) from share-based compensation plans	(1,981)		(1,981)
Retirement benefit adjustments, net of taxes	3,386					3,386
Dividends	(12,562)			(12,562)
Net income	123,669			123,669
Balance at Mar. 31, 2015	4,806,346	$ 15,741	1,440,690	3,578,100	(11,453)	(216,732)
Balance (in shares) at Mar. 31, 2015		124,763
Balance at Dec. 31, 2015	4,772,459	$ 15,743	1,458,532	3,509,792	(12,223)	(199,385)
Balance (in shares) at Dec. 31, 2015		124,818
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net shares issued (acquired) under share-based compensation plans	(2,848)	$ 0	(6,637)		3,789
Net shares issued (acquired) under share-based compensation plans (in shares)		427
Share-based compensation	5,923		5,923
Excess tax benefit (shortfall) from share-based compensation plans	(820)		(820)
Retirement benefit adjustments, net of taxes	2,515					2,515
Dividends	5			5
Net income	122,799			122,799
Balance at Mar. 31, 2016	$ 4,900,033	$ 15,743	$ 1,456,998	$ 3,632,596	$ (8,434)	$ (196,870)
Balance (in shares) at Mar. 31, 2016		125,245